Day 1 :
Keynote Forum
Edward Lee Ruff
York University, Canada
Keynote: Preparation of novel nucleoside analogues from cyclobutane precursors as potential antiviral agents
Time : 00:00-00:30
Biography:
Abstract:
Cyclobutanes represent strained compounds which exhibit chemical reactivity not encountered with unstrained ring systems. These properties have been exploited in their capacity as synthetic intermediates. Cyclobutane nucleosides as oxetanocin analogs have been shown to exhibit antiviral and other biological activities.1 Our interests in cyclobutanone chemistry has prompted investigations into the preparation of novel cyclobutane nucleoside analogs. We report in this paper the synthesis of novel cyclobutanols 2 and 3 from its precursor 1. The coupling of 6-chloropurine with 1 gives two regioisomers consisting of the N-9 and N-7 ketones with the latter formed as the major product.. These were selectively reduced using a hindered hydride donor to
Keynote Forum
P. Gregory Van Patten
Middle Tennessee State University, USA
Keynote: Developing cation exchange as a viable strategy for nanoparticle synthesis
Time : 00:00-00:30
Biography:
Dr. Van Patten is Professor and Chair of Chemistry at Middle Tennessee State University specializing in the study of semiconductor quantum dots (QDs). His recent focus has been the study of cation exchange as a means to access new types of QDs that are challenging or impossible to synthesize by more direct routes. In the past, Van Patten has also studied QD self-assembly in solution, resonance energy transfer between QDs, and ultrafast photophysics of QDs. After earning his Ph.D. in Chemistry at the University of South Carolina, Van Patten served as a postdoctoral associate at the Los Alamos National Laboratory, studying the light harvesting properties of polymer films impregnated with metalloporphyrins and related dyes. His work has produced over 40 publications and 2 patents. In 2008, he was awarded a Research Fellowship by the Alexander von Humboldt Foundation.
Abstract:
Semiconductor quantum dots (QDs) are promising materials with interesting, size-dependent properties. Although a few model systems (CdSe, PbS, and some others) have been developed, optimized, and thoroughly studied over the past few decades, there remain several obstacles that prevent their adoption in a variety of applications. One principal challenge is the inability to access a diverse range of QD materials with excellent control over size, shape, crystallinity, and surface chemistry. Control over these QD characteristics is crucial for the production high quality materials. Since direct synthetic approaches that afford such control have been elusive, we have been exploring cation exchange (CE) as a route to QDs with new compositions. To make CE a viable approach, it must be scalable, must be widely applicable, and must proceed to completion. Additionally, it is desirable to be able to achieve partial exchanges to produce alloy or heterostructures. I will summarize our progress on these goals to date.
Keynote Forum
Yong-Li Zhong
Merck & Co., Inc., USA
Keynote: Practical asymmetric synthesis of a HCV nucleoside cyclic prodrug
Time : 00:00-00:30
Biography:
Yong-Li Zhong has completed his PhD in 1998 from the Chinese University of Hong Kong and postdoctoral studies from The Scripps Research Institute in San Diego. He joined Process Research & Development, Merck & Co., Inc., in 2001 and currently holds the position of principal scientist at Merck. He has published more than 85 papers in reputed journals and has 20 patents.
Abstract:
Chronic hepatitis C virus (HCV) is a liver disease that has infected an estimated 130 to 150 million people worldwide as of 2016 and killed an estimated 500,000 people around the world annually. In spite of several medicine therapies for the treatment of HCV being available, treatment failure and resistance still remain a clinical challenge. For these reasons, the search for effective antiviral agents to combat HCV is an ongoing endeavor within the global medical/pharmaceutical community. As part of an ongoing drug discovery program in our laboratories, the title compound has been identified as one such selective and potent inhibitor of HCV NS5B nucleoside polymerase. This nucleoside cyclic prodrug is a complex, densely functionalized small molecule, which represents numerous challenges for chemical synthesis. Herein, we report a new asymmetric, practical synthetic route, which features several remarkably diastereoselective and high yielding transformations for the synthesis of the target starting from readily available starting materials.
Keynote Forum
Maged Henary
Georgia State University, USA
Keynote: Microwave-assisted synthesis of a library of near-infrared molecular probes for in vivo imaging
Time : 00:00-00:30
Biography:
In 1990, Maged Henary received his BSc. degree in chemistry from Alexandria University and in 2000 he received his Ph.D. degree in organic chemistry from Georgia State University (GSU) under the direction of Professor Strekowski. Afterwards he joined Professor Fahrni’s lab at Georgia Institute of Technology. Dr. Henary developed sensors for imaging microscopy of labile zinc and copper pools in live cells. In 2005, he was appointed Lecturer at GSU instructing Undergraduate classes. In 2011, he accepted a position as Assistant Professor at GSU. His research focuses on the development of heterocyclic compounds, including NIR dyes for bioanalytical applications.
Abstract:
A microwave-assisted method for the synthesis of a library of near-infrared (NIR) molecular probes such as symmetrical pentamethine cyanines and their corresponding precursors. This class of compounds is advantageous for in vivo imaging because of the low absorption of biological molecules in the NIR window. The microwave synthesis drastically reduced the reaction time for dye synthesis from days to min, as well as producing increased yields (89-98%) to the conventional heating method (18-64%). Also in this study, we demonstrate that it is possible to create tissue-specific (thyroid, salivary, and adrenal glands) near-infrared fluorophores using the inherent chemical structure. Thus, a single compact molecule performs both targeting and imaging.
Keynote Forum
Yong Li Zhong
Merck & Co., Inc., USA
Keynote: Practical asymmetric synthesis of a HCV nucleoside cyclic prodrug
Time : 00:00-00:30
Biography:
Yong-Li Zhong has completed his PhD in 1998 from the Chinese University of Hong Kong and postdoctoral studies from The Scripps Research Institute in San Diego. He joined Process Research & Development, Merck & Co., Inc., in 2001 and currently holds the position of principal scientist at Merck. He has published more than 85 papers in reputed journals and has 20 patents.
Abstract:
Chronic hepatitis C virus (HCV) is a liver disease that has infected an estimated 130 to 150 million people worldwide as of 2016 and killed an estimated 500,000 people around the world annually. In spite of several medicine therapies for the treatment of HCV being available, treatment failure and resistance still remain a clinical challenge. For these reasons, the search for effective antiviral agents to combat HCV is an ongoing endeavor within the global medical/pharmaceutical community. As part of an ongoing drug discovery program in our laboratories, the tile compound has been identified as one such selective and potent inhibitor of HCV NS5B nucleoside polymerase. This nucleoside cyclic prodrug is a complex, densely functionalized small molecule, which represents numerous challenges for chemical synthesis. Herein, we report a new asymmetric, practical synthetic route, which features several remarkably diastereoselective and high yielding transformations for the synthesis of the target starting from readily available starting materials.
- Sessions & Tracks:
Fundamental Concept of Organic Chemistry
Medicinal Chemistry, Drug Synthesis
Biorganic and Biochemistry
Modern Organic Chemistry and Applications
Stereochemistry of Organic Compounds
Advanced Synthesis and Catalysis
Physical Organic Chemistry
Inorganic Materials and Nanoparticles
Session Introduction
Mahesh Sanzgiri
Dynamic Management Services Based in Mumbai, India
Title: Isolation, Identification & Field Studies On Tiger Pheromones
Time : 00:00-00:25
Biography:
Dr. Mahesh N.Sanzgiri M.Sc., PhD in Organic Chemistry from Bombay University in 1984 under guidance of Prof. V.V.Nadkarny of St. Xavier’s College, Mumbai. His research is dedicated to “Study of Few Derivatives of Anthrone & Pheromones". His research work for application of derivatives of anthrone in anti cancer & antiaids activity is a new approach with synthesizing organic compounds using functional groups for trapping active cancer cells & removing aids activity. His work on asolating & synthesizing Tiger pheromones from Tiger urine and preparing same molecule in lab synthetically by using chemical method. Its application is in Wild Perfumes. With wide experience in working with multinational German Chemical & Pharma co. MERCK in INDIA for many years on responsible position, presently Dr.Mahesh Sanzgiri works as a free lance scientist & consultant for doing research & development, also consultant for cGMP, WHO, USFDA, ISO etc. with various well-known Indian & multinational Indian & foreign companies.
Abstract:
Pheromones, although well-known in the insect world, not much work has been done in the case of mammals. The aim of present study was to isolate, identify the Tiger Pheromones. In order to do the field studies, especially in using this as a Biochemical Marker by Tiger in territory marking and communication especially during mating season, the studies were carried out in forest.
For the study, tiger urine was collected from different zoos in month of January, March, July and September to cover most of the seasons of the year.
For separation of components of Tiger Urine for study purpose MERCK HPTLC and Preparative Layer Chrometographic techniques were used and so also electrophoratic run on Whatsmann’s paper. To confirm functional groups of components separated, IR Specturum was used.
Majid M Heravi
Alzahra University, Iran
Title: Diketene-based multicomponent reaction strategy toward N-heterocycles
Time : 00:00-00:25
Biography:
Majid M Heravi has completed his PhD at the age of 28 years from Salford University , England and postdoctoral studies from University of California at Revirside, USA. He is the professor in organic chemistry at Alzahra University . He has published more than 700 papers in reputed journals cited by Web of Science and Scopus and has been serving as guest editor for 3 thematic issues of Current Organic Chemistry. He has also published 11 chapters as sole corresponding author in Advances in Hterocyclic Chemistry in which five of them have focused on the chmistry of ketenes and diketene.
Abstract:
Diketene (4-methylene-oxetan-2-one or DK) consists of a four-membered lactone ring adjacent to a methylene function and it can be considered the anhydride of acetoacetic acid. DK is a reactive, readily available, and versatile molecule. Diketene also reacts with alcohols and amines to the corresponding acetoacetic acid derivative. DK appears to be an ideal molecule to be used in organic transformations. Diketene possesses electrophilic and nucleophilic sites which are capable of undergoing numerous reactions. In 1986 the chemistry of DK has been extensively and comprehensively reviewed by R.J Clemens. In the last decade, various interesting multicomponent reactions based on DK successfully achieved leading to the construction of a wide variety of heterocyclic systems. Very recently, we also published on the applications of DK as a privileged synthon in the synthesis of heterocyclic compounds as a chapter in Advances in Heterocyclic Chemistry. Continuing our efforts in the development of multicomponent reaction for the synthesis of potential biological activity nitrogen-containing heterocycles, in the present work, we describe the efficient synthesis of poly-substituted nitrogen-containing heterocycles, such as 1,4-dihydropyridines, pyrido[1,2-a] pyrimidines and spiro[indoline-3,4'-pyrano-pyrazole] derivatives via MCRs involving diketene.
Musa M. Musa
King Fahd University of Petroleum and Minerals, Saudi Arabia
Title: Stereoinversion of R-configured secondary alcohols using a single enzymatic approach
Time : 00:00-00:25
Biography:
Musa M. Musa has completed his PhD at the age of 30 years from University of Georgia and postdoctoral studies from University of Minnesota. In 2009, he joined King Fahd University of Petroleum and Minerals (KFUPM) as Assistant Professor. He is currently an Associate Professor of Chemistry at KFUPM. His research interests include employing enzymes in organic synthesis. More specifically, he is interested in enzyme-catalyzed racemization, deracemization, and dynamic kinetic resolution of alcohols. He has published more than 30 papers in reputable journals.
Abstract:
Controlling enantioselectivity of alcohol dehydrogenase-catalyzed transformations using site-directed mutagenesis enabled their use in stereoinversion of enantiomerically pure alcohols. We developed a single-enzymatic approach for stereoinversion of (R)-configured alcohols to the opposite enantiomer in high percent conversion and high enantioselectivity. A single mutant of Thermoanaerobacter ethanolicus secondary alcohol dehydrogenase (TeSADH) was used in this approach. Oxidation under conditions that allows selectivity mistakes to take place enabled the depletion of (R)-alcohol to the corresponding ketone, which is then reduced under stereoselective conditions to produce the corresponding (S)-configured alcohols without isolating the ketone intermediate. Controlling the stereoselectivity of the oxidation and reduction reactions by varying the amounts of acetone and 2-propanol, respectively, is the key for this stereoinversion process. This stereoinversion approach, which utilizes a single enzyme in two steps in one pot, presents a biocatalytic alternative to Mitsunobu inversion reaction.
Md. Wahab Khan
Bangladesh University of Engineering and Technology, Bangladesh
Title: Synthesis of bimetallodendrimer nanoparticles based on diazine and triazine and application as catalyst for c-c coupling reactions
Time : 00:00-00:25
Biography:
Dr Md. Wahab Khan is a Professor of the Department of Chemistry at BUET, Dhaka, Bangladesh. He has supervised 30 post graduate students and published 30 papers in the reputed international journals. He was the Secretary General of Federation of Asian Chemical Societies (FACS) for the term 2016-2017 and General Secretary of Bangladesh Chemical Society (BCS). He is National Representative (NR) of Organic and Bimolecular Chemistry division III of IUPAC for 2018-2019. He is a Member of FACS EXCO for the term 2018-2019. He is a member of editorial board of JBCS.
Abstract:
The emergence of nanotechnology for synthesizing bimetallic nanoparticles is presenting new possibilities for a potential revolution in the field of catalysis. Dendrimers are particularly attractive hosts for catalytically active metallic nanoparticles. The bimetallic nanoparticles (NPs) included in dendrimer are important materials because they demonstrate improved performance compared to mono metallodendrimer in many systems when used as catalysts. The review of this lesson focuses on the latest scientific achievements in bimetallic dendrimer in terms of synthesis and their use as catalysts. The nanoparticles of Pd/Cu nuclei are synthesized using reducing agents NH2-NH2. H2O with the presence of stable agent's triazine-based dendrimer compound. Palladium-copper bimetallic dendrimer nanoparticles are characterized by UV-spectroscopy, IR spectroscopy, SEM, EDX, XRD, TGA and DSC techniques. The catalytical activity of bimetallic nanoparticles has been investigated in various coupling reaction such as Heck, Sonogashira, Suzuki etc. The SEM images of the Pd/Cu bimetallic NPs shows the spherical size of the particle about range from 28 nm-52 nm and nanocluster of our synthesized compound. From EDX analysis, the presence of Palladium and Copper was well observed and Copper was 61.39% of mass and Palladium was 3.39 % of the mass of synthesized NPs.
Ikechukwu P. Ejidike
Vaal University of Technology, South Africa
Title: In-vitro antioxidant and antibacterial studies of heterocyclic schiff base nickel(ii) complexes: Synthesis and characterization
Time : 00:00-00:25
Biography:
Ejidike Peter completed his PhD from University of Fort Hare, South Africa. He is presently a postdoctoral fellow and supervising postgraduate students at Department of Chemistry, Faculty of Computer and Applied Sciences, Vaal University of Technology. He has published more than 18 research articles in reputed journals; others under review, and has been serving as a reviewer to various journals. He has taught chemistry at high schools, pre-varsity and university. He is a professional chemist member and member of the South African Chemical Institute (SACI) and International Union of Pure and Applied Chemistry (IUPAC), Member, Royal Society of Chemistry (MRSC).
Abstract:
Schiff base-transition metal complexes obtained from heterocyclic molecules have received attention from many researchers regarding the development of bioinorganic compounds for biological application. The strategic design of biologically active molecules is a vigorous task and the variables affecting biological activity are diverse. Metal based antioxidants have gained recent attention for their ability to protect living organisms and cells from damage caused by oxidative stress or scavenge free radicals. In view of the growing interest in the development of new therapeutic agents and DNA probes for disease defence, we present nickel (II) complexes of tridentate Schiff bases with a N2O donor atoms set and formulated as: [Ni(L)X]∙nH2O, (where L = Tridentate donor ligands, X = Cl‑, Br-, NO3-, CH3CHOO-). The synthesized compounds were air stable and characterized spectroscopically. The spectra data showed that the ligands coordinate Ni ion through the azomethine nitrogen and enolic oxygen atoms. Electronic spectral measurements indicated a square planar geometry for all the complexes. The antioxidant activities of the complexes were investigated through scavenging activity on 2,2-Diphenyl-1-picrylhydrazyl (DPPH) and 2-2′-Azino-di-[3-ethylbenzthiazoline sulfonate] (ABTS) radicals. The x-ray diffraction (XRD) analysis showed that the complexes possess crystallite sizes. The obtained IC50 values for the nickel complexes were higher than Schiff base ligand. The compounds were screened against two Gram-positive (S. aureus and E. faecalis) and two Gram-negative (K. pneumoniae and P. aeruginosa) bacterial strains. The antibacterial activity of the isolated compounds was found to possess MIC values in the range 1.564 - 12.5 mg/ml against the strains. However, antioxidant activities of the complexes showed moderate to strong free radical inhibitors for treating pathological damage associated with radical-generation leading to aging and cancer.
Han Zhou
Georgia State University, USA
Title: Linkage-specific di-Ubiquitin probes to illustrate Ubqiuitin Chain assembly
Time : 00:00-00:25
Biography:
Han Zhou has completed his bachelor and master degree from College of Pharmacy in Peking University Health Science Center. Now he is a fifth-year PhD candidate in Department of chemistry, Georgia State University under Dr Jun Yin. His main focus is chemcial biology and medicine chemistry in Ubiqiuitin transfer pathway.
Abstract:
The length and linkage types (K11, K48, K63, etc) of ubiquitin (UB) chains regulate the biological activities of proteins they modify. Synthesizing ubiquitin chains with defined linkage is challenging but vitally important for elucidating the signals encoded in protein ubiquitination. Here, we generated linkage-specific diUB probes with a thiol functionality at the linkage to enable its conjugation with E2, E3, and deubiquitinating enzymes (DUB) in the UB transfer pathways. We took advantage of unnatural amino acid (UAA) incorporation to substitute specific Lys residues in UB with N6-(thiazolidine-4-carbonyl) lysine (ThzK). We then converted ThzK to Cys-conjugated Lys (CysK) to enable the assembly of diUB probes by native chemical ligation. Our development of the diUB probe provides a new method to decode UB-mediated cell signaling.
Mariarosa Raimondo
Institute of Science and Technology for Ceramics ISTEC CNR, 48018 Faenza (Italy)
Title: Amphiphobic nanostructured coatings for industrial applications
Time : 00:00-00:25
Biography:
M. Raimondo as Industrial Chemist is a senior researcher and project leader on “Smart and multifunctional industrial materials” at ISTEC CNR, Faenza (Italy).
Expertise: design of innovative coatings and methodologies to provide ceramics, glasses, metals and alloys of super-hydrophobicity, amphiphobicity, switchable hydrophilicity/hydrophobicity. Development of coatings for friction, drag and noise reduction (industrial sectors: mechanic, marine), with anti-icing (aerospace, electric conduction systems), anti-corrosion, anti-fouling, anti-soiling and anti-reflective properties (PV and building industry). Author of more than 80 papers on international journals and 50 communications at international conferences.
Abstract:
Today different industrial sectors - aerospace, marine and naval, mechanic, energy, etc. - need of innovative technical solutions allowing to reduce the surface wetting against water and low-surface tension liquids or fluids. Wettability depends in a complex way on structural and chemical features of surfaces interacting with the surrounding working environments and conditions. In the last years, a lot of studies have focused on the possibility of mimicking the ability of living organisms to repel water and oily substances by perfectly, mostly hierarchically, organized structures and a low surface energy chemical composition.
This lecture will focus on the design of amphiphobic (superhydrophobic and oleophobic) glasses and ceramics, metals and alloys, by deposition of nano-oxides suspensions (particles diameter up to 30 nm) in alcoholic or water based media, eventually coupled with perfluorinated, lubricant compounds, providing the materials of solid-liquid-air or, alternatively, solid-liquid-liquid working interface. Optically transparent, nanostructured organic/inorganic hybrid coatings, with contact angles (CA) against water as high as 178°, CA with n-hexadecane (surface tension γ = 27 mN/m @ 20°C) in the 140-150° range and CA hysteresis lower than 5° have been produced. A full characterization of the surface chemistry has been undertaken by XPS analyses, highlighting the different coating’s components in the hybrid structure, while FESEM observations allowed to estimate the coating’s thickness (300-400 nm) and their structural features (flower-like lamellas, agglomeration of spherical nanoparticles, etc).
The correlation between the surface properties and the wetting performances will be analized in order to locate the potential field of industrial application. For this purpose, data on amphiphobic surfaces as solutions for anti-icing, anti-soiling, drag and friction reduction, improvement of thermal exchange coefficient will be presented.
Elmadani Fatimazahra
Sidi Mohamed Ben Abdellah University, Morocco
Title: Impact of certain chemical pollutants on the onset of symptoms of endocrine diseases in the Dokkarat-Fez-Morocco zone
Time : 00:00-00:25
Biography:
Elmadani Fatimazahra has her expertise in identification and treatment of pollutants with a potential for endocrine disruptors . She will discuss her phd dissertation on 2019 in the university of sidi Mohamed Ben Abdellah, Fez, Morocco She has one published paper in Journal of Materials and Environmental Science
Abstract:
Pollution of the environment and the permanent exposure of human beings to toxic heavy metals such as chromium, mercury, cadmium, lead, contribute to the increase in water pollution which causes the appearance of serious diseases of endocrine origin. Indeed, the industrial sector knows a wide use of toxic chemicals that threaten in a worrying and alarming way the environment and the man whose part is conveyed by the water in the neighboring wadis or infiltrated by the ground in the tablecloths groundwater. The objective of this study is to determine the toxic chemical substances responsible for endocrine disruptors in the population adjacent to the polluting industries of the industrial zone Dokkarat - a city of Fes. The study consisted in carrying out, as a first step, a cross-sectional epidemiological study on 380 people of the target population and, in a second step, the environmental study of Fez waters near the study area. The analysis of the survey data shows a strong correlation between the excessive use of chemicals and the appearance of endocrine pathological signs and those of the environmental study of Fez wadi water, which are analyzed by measuring the physicochemical parameters. chemical, bacteriological and metallic, the majority of the results do not comply with the standards for the quality of surface water.
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- Sessions & Tracks:
Analytical Chemistry
Physical Organic Chemistry
Inorganic and Bioinorganic Catalysis
Medicinal Chemistry, Drug Synthesis
Inorganic Materials and Nanoparticles
Organometallic Chemistry
Advanced Synthesis and Catalysis
Modern Organic Chemistry and Applications
Session Introduction
Mahesh Sanzgiri
St. Xaviers College, India
Title: Synthesis of azomethines of anthrones and 10- arylidene anthrones and testing for anticancer and anti-aids activity
Time : 00:00-00:25
Biography:
Dr Mahesh N. Sanzgiri MSc, PhD in organic chemistry from Bombay University in 1984 under guidance of Professor V. V. Nadkarny of St. Xavier’s College, Mumbai. His research is dedicated to “study of few derivatives of anthrone and pheromones. His research work for application of derivatives of anthrone in anti-cancer and antiaids activity is a new approach with synthesizing organic compounds using functional groups for trapping active cancer cells and removing aids activity. He is also working on isolation and synthesizing of Tiger pheromones from Tiger urine and preparing same molecule in lab synthetically by using chemical method. Its application is in Wild Perfumes. With wide experience in working with multinational German Chemical and Pharma Co. Merck in India for many years on responsible position, presently he works as a freelance scientist and consultant for doing research and development, also consultant for cGMP, WHO, USFDA, ISO etc. with various well-known Indian & multinational Indian and foreign companies.
Abstract:
A new series of azomethines of anthrones have been prepared by condensing anthrone with different primary amines, o-aminophenol, and p-aminobenzoic acid. Similarly, 10-Arylidene anthrones with different functional groups were synthesized using Acetic Anhydrite as well as ethanol as solvent. It is found that Azomethines of anthrones prepared by condensing primary amines with the nitro group in p-position of aromatic ring indicate intense anticancer activity in-situ as compared to other azomethines of anthrones. It is also proved that azomethine group stabilized by aromatic ring shows anticancer activity, but Nitro group in p-position of an aromatic ring can be considered for further investigation for the development of an anticancer drug, after doing detailed toxicity studies. Similarly, 10-Arylidene anthrones with Nitro group in p-position of the aromatic ring shows anti aids activity in-situ. However detailed studies of toxicity should be done before considering for further development of antiaids drugs.
Ali Mohd Lone
Govt. Degree College for Women Baramulla, India
Title: Divergent approaches to the synthesis of fused furo[3,2-b]furanone scaffold embodied in bioactive natural products
Time : 00:00-00:25
Biography:
Prof. A M Lone completed his Ph.D in Medicinal Chemistry from Indian Institute of Integrative Medicine (IIIM) Jammu and is currently working as Assistant Professor in the Department of Chemistry Govt Degree College for Women Baramulla. He has expertise in the total synthesis of bioactive molecules, development of novel strategies and structural modification of natural molecules for lead optimization.
Abstract:
Furo-furanones are the bicyclic compounds in which furan ring is attached to a furanone ring through face-b. Functionally embellished furo[3,2-b]furanone moiety has been widely encountered as a distinctive sub-structure among a diverse range of natural products of mixed biosynthetic origin (Figure). Representative examples of natural products incorporating the furo[3,2-b]furanone segment as part of their complex architecture are neovibsanins A and B), lactonamycin, schisandra nortriterpenoids (e.g., micrandilactone A), plumericin, pallavicinin and neopallavicinin and plakortones (e.g., plakortone E). All these natural products exhibit wide-ranging biological activities. Thus, the furo[3,2-b]furanone core appears to be a promising and potent pharmacophoric group that imparts considerable therapeutic value to the natural products that embody it. This attribute along with the complex, challenging and diverse natural product architecture into which furo[3,2-b]furanone core is embedded, has generated considerable interest in assembling this moiety. In the present study, a simple and straightforward methodology of general utility to construct sterically encumbered furo[3,2-b]furanone scaffolds present in a diverse range of bioactive natural products is delineated. The methodology emanates from readily available Morita–Baylis–Hillman (MBH) adducts and employs sequential ring closing metathesis and oxy-Michael addition cascade as the key steps.
Figure. SAR of 2-alkyl/aryl-aminomethylene cycloalkane-1,3-diones against M. Tuberculosis.
Tanvir Sultana
Bangladesh University of Engineering and Technology, Bangladesh
Title: Physicomechanical and thermal properties of betel nut husk nanofiber reinforced polymer composites
Time : 00:00-00:25
Biography:
Mrs Tanvir Sultana is a PhD student of Bangladesh University of Engineering and Technolog, BUET, Dhaka under the supervision of Professor Md. Wahab Khan. She has published 3 papers in the reputed journal. She is a PhD fellow of Bangladesh University Grant Commission (UGC). She is an Assistant Professor of Chemistry of the government college of Bangladesh under Ministry of Education.
Abstract:
Cellulose extracted from Betel Nut husk fiber were converted to cellulose nanofiber by chemical and mechanical technique to examine their potential for use as reinforcement fiber in biocomposite applications. The cellulose isolated from betel nut husk fiber were subjected to acid hydrolysis using 62% sulfuric acid under ultrasonic treatment. The product was allowed to stand at room temperature to cool and the acid was removed by washing, centrifuged and dialysis with distilled water at room temperature. Betel nut husk fiber was also converted to nanofiber by the milling process. The present work was to investigate the possibility of breaking down the structure to submicron and nanoparticles by high energy planetary ball milling by SFM-1 Desk-Top planetary Ball-Miller, MTI Corporation. Cellulose nanofiber reinforced polymer composites were prepared with different weight percentages (1 wt% to 5 wt%) via casting methods. The tensile, thermal and morphological properties were studied for all composites. Enhancement in the tensile, thermal and morphological properties was shown in the nano-cellulose reinforced composites. Cellulose nanofiber and its reinforced polymer composites were characterized by FTIR, TGA, DSC, Nano Zetasizer, and X-ray diffraction. Its structural morphology was also studied by Scanning electron microscope.
Kallol K. Ghosh
Pt. Ravishankar Shukla University, India
Title: Design and development of novel functionalized surfactants and mixed micellar systems for chemical reactions
Time : 00:00-00:25
Biography:
Dr Kallol Kumar Ghosh is currently a Professor of Chemistry in School of Studies in Chemistry, Pt. Ravishankar Shukla University, Raipur, India. He received his MSc Degree ( Physical Chemistry) in 1981 and PhD Degree in 1986 from Pt. Ravishankar Shukla University under Professor S G Tandon. He has done postdoctoral work on artificial siderophores in the laboratory of Professor Akira Katho, Seikei University, Tokyo, Japan as an INSA JSPS visiting fellow. He was a James Chair visiting fellow in St. Francis Xavier University, Antigonish, Canada. He is the recipient of Bronze Medal of Chemical Research Society of India and Prof. B. N. Ghosh award of Indian Chemical Society. His research interest comprises surface chemistry, chemical kinetics and reaction mechanism, development of novel reactivators, micellar catalysis, micellar enzymology, functional surfactants, surfactant protein interactions, ionic liquids, and nanomaterials. He has published more than 170 research papers in various national and international journals. Under his supervision, 26 persons have completed Ph.D. Apart from his teaching and research activities, he has been engaged in various professional activities of Pt. Ravishankar Shukla University, to name a few, Director, National Centre for Natural Resources, Coordinator Public outreach center, and coordinator Inspire program etc.
Abstract:
The studies on kinetics and physicochemical properties of novel functionalized green surfactants are of paramount importance for the acyl transfer reactions. Over the past several years we have been trying to figure out new micellar hydrolytic catalysts as nonreactors for the various chemical reactions. The functionalized surfactants with pyridinium/ imidazolium core in their head groups and α-nucleophilic moiety viz. oximate/hydroxamate/ amidoximate groups have been established. More recently, however, the focus has shifted to surface active ionic liquids (SAIL) as a green micellar system. In this presentation, the important trends, recent development and novel strategies for the kinetic efficiency of some pyridinium based functionalized surfactants and SAIL toward the micellar hydrolysis of carboxylic and phosphate esters will be reviewed. The physicochemical and surface properties of a single and mixed system of functionalized surfactants have been studied by surface tension, conductivity and fluorescence measurements. The deprotonation behavior has also determined. The various quantitative kinetic models and theories of mixed micellization have also been applied successfully.
Senait Aklog
Bahir Dar Institute of Technology, Ethiopia
Title: Atomic absorption spectrometric determination of the concentration of Fe, Mn, Pb and Cd in fruits of mango, avocado and papaya from Gondar “Arada†Market Gondar, Ethiopia
Time : 00:00-00:25
Biography:
Ms. Senait Aklog Tesfaw, has full chemistry back ground in both BSc. and MSc. Currently, she is a lecturer in analytical chemistry and working at Bahir Dar University Institute of technology Ethiopia, based on her academic and work profession. Her main responsibilities are teaching, conducting research, giving community service, organizing laboratories, assisting project works on chemical engineering students, preparing modules and participating in different affairs of our institution. Recently she has one published paper and two research works which have been completed and is trying to publish those research works.
Abstract:
Statement of the Problem: Contaminations of the environment by heavy metals with their potential effect on health, agriculture and natural ecosystem have a subject of worldwide concern. In Ethiopia, especially in the place where some fruits are found such as Gondar and Bahir Dar, fruits have been used for human consumption without having knowledge of the content of essential and non-essential elements in some selected fruits.
Purpose of this study: It is to aware the society to be careful when they are eating not to take the fruit above and below their threshold limit or daily allowance limit because the fruits contain some heavy and toxic metals which have a great role in affecting human health.
Methods: An atomic absorption spectrometer has been used for the study. Additionally, Different wet-digestion methods were tested to select optimum procedure. The validity of the optimized digestion procedure for fruits was checked by carrying out spiking test and analyzing percent recovery. The study was analyzed using Origin 8 and SPSS (version 20) software.
Results: The mean concentrations of Fe, Pb, and Mn, in fruit were comparable with WHO recommended values but the concentration of Cd showed greater than the threshold value.
Conclusion: The results of sample analysis and their comparison with standard values showed that the average concentration of all heavy metals in the studied fruits was comparable with the standard levels of the WHO they had acceptable conditions for human consumption except the level of Cd.
Recommendations: It would be worthwhile doing a comprehensive analysis not only fruits but also vegetable, soil, and water at different farm places.
Table1. Comparison of Mean concentrations of trace metals of mango sample with recommended (WHO/FAO) values and other publications
Where E = element , TSAC = This study avergae concentration
|
E |
TSAC(µg/g)
|
(Mahdavian, et al.,2008) |
(Zahir et al .,2009) |
Permissible value (µg/g)
|
|
Mango |
||||
|
Fe |
65.5 ±1.2 |
75.16 |
9.5 ± 4.3 |
75 |
|
Pb |
0.25 ± 0.1 |
67.20 |
1.9 ± 0.9 |
0.3 |
|
Cd |
0.2 ± 0.02 |
16.9 |
0.27 ± 0.05 |
0.1 |
|
Mn |
3.9 ± 0.09 |
11.59 |
0.05 ± 0.03 |
5 |
Davoud Dastan
Georgia Institute of Technology, USA
Title: Development in organic field effect transistors based on organic-inorganic materials
Biography:
Dr Davoud Dastan is a research associate at Georgia Institute of Technology. Prior to his appointment at George Tech., he was a post-doc. fellow at Cornell University, Ithaca, New York, USA. He is working on nanomaterials for energy applications. He has published several papers and has been serving as an editorial board member of repute.
Abstract:
Nanocomposite materials have been used to fabricate organic field-effect transistors (OFET’s) using low-cost spin coating technique. The composite materials demonstrated outstanding properties such as high dielectric constant and high homogeneity. These devices are common in modern day development of organic electronics. Until recently, most research regarding OFET’s has been focused on developing novel process techniques whereas enhancement in the mobility has remained stagnant. Gold contacts were thermally made on top of the substrates to fabricate top-contact bottom-gate devices. High dielectric constant (k) materials were employed to decrease the power consumption of the fabricated FET’s. The current leakage was very low which indicates the reliability of these devices based on high-k materials. The electrical features such as output and transfer characteristics of the devices were measured using semiconductor parameter analyzer. The obtained results illustrated low operating voltage, high ON current and fast operation. Additionally, the simulation was performed to elucidate the growth mechanism of gate layer on the substrates and its contribution to the enhancement of the electrical properties of the fabricated devices.
- Posters & e-posters:
Session Introduction
Mohammad H. Alotaibi
King Abdulaziz City for Science and Technology, Kingdom of Saudi Arabia
Title: Hydrogen generation from formic acid decomposition using a Iradium-Palladium (Ir-Pd) nanoparticles supported on different supports
Time : 00:00
Biography:
Abstract:
Introduction: In recent years, attention was turned to hydrogen generation and their importance rule in future energy and for storage/generation for fuel-cells-based H2. Formic acid (HCOOH) is the main product from biomass processing has important possess such as handled safely in aqueous solution, high-energy density, non-toxic material, high energy density and excellent stability at room temperature. Two expected pathways for the decompositions of formic acid, dehydrogenation to produce hydrogen (H2) and carbon dioxide (CO2) which shows in equation 1, and dehydrogenation to produce carbon monoxide (CO) with water (equation 2).
HCOOH (l) H2 (g) + CO2 (g) ∆G298K= - 35.0 kJmol -1 (Equation 1)
HCOOH (l) H2O (l) + CO (g) ∆G298K= - 14.9 kJmol -1 (Equation 2)
Production of CO can poison the catalyst. Therefore, it is important to find catalyst can push the reaction selectively to follow the first pathway.
Experimental/methodology: (0.5, 1 and 2 % mole) of Ir using iridium chloride obtain from (Sigma-Aldrich) were mixed with 15% Hydrochloric acid in a flask under stirring and heating at 80 °C, and 3 g active carbon or TiO2 obtained from (Alpha Chemical) was then added. The mixtures were continuously stirred and heated at 80 °C overnight, then washed with distilled water several times and dried at 100 °C overnight. Then, the final catalysts were calcined and reduced at 400 °C for 4 h. Furthermore, (2.5 % mole ratio) of Ir using iridium chloride obtain from (Sigma-Aldrich) and Pd (0.5, 1 and 2 % mole ratio) using Pd acetate obtained from (Sigma-Aldrich) were mixed with 15% Hydrochloric acid in a flask under stirring and heating at 80 °C, and 3 g active carbon or TiO2 obtained from (Alpha Chemical) was then added. The mixtures were continuously stirred and heated at 80 °C overnight, then washed with distilled water Several times and dried at 100 °C overnight. Then, the final catalysts were calcined and reduced at 400 °C for 4 h.
Results and discussion: In this investigation, we aim to study the effect of Iridium and Palladium noble metals supported on two different supports for the decompositions of formic acid. Several catalysts of supported Iridium and Palladium with different metal ratio have been prepared by impregnation method. The physicochemical properties of the prepared catalysts were characterized with XRD, TEM, EDS, IR, UV, and BET. These catalysts were tested for the decompositions of formic acid using liquid phase reaction. The reaction conditions were decomposition of 10 ml of diluted formic acid (0.5 M, 0,005 mol) on the known amount of the catalyst with ratio 1:1000. The reaction temperature was varied and that for 4 hours reaction time. In conclusion, Ir and Pd bimetallic show very strong interaction and exhibited a good stability and high activity for the decomposition of formic acid to produce hydrogen.
Muluye Melak Zenebe
University of Gondar, Ethiopia
Title: Isolation, structural elucidation, and bioactivity studies of leaf extract of Vernonia amygdalina
Time : 00:00
Biography:
Abstract:
Vernonia amygdalina (VA) is a tropical African plant of the Asteraceae family and is occasionally cultivated for its medicinal uses, which include as a treatment for diarrhea, skin wounds, fever mastitis and warms infection. The aim of this study is to isolate and elucidate the structure of some of the chemical constituents from the leaf of Vernonia amygdalina and its bioactivities. Methanol extract of Vernonia amygdalina, after repeated chromatography led to the isolation of a different compound, one of this compound (MM-4) is partially characterized based on the spectral data (IR, 1H NMR, 13C NMR, and DEPT) and Extracts from Vernonia amygdalina have been shown to have antimicrobial activity.
Key words: - Vernonia amygdalina, Asteraceae
Seok-Young Oh
University of Ulsan, South Korea
Title: Sorption of nitro explosives to polymer/biomass-derived biochar: Affecting factors and toxicity
Time : 00:00
Biography:
Abstract:
Factors affecting the sorptive removal of nitro explosives [2,4,6-trinitrotoluene (TNT) and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX)] to polymer/biomass-derived biochar were investigated through batch experiments. Compared to that of rice straw (RS)-derived biochar, the sorption of TNT and RDX to polymer/RS-derived biochar was greatly enhanced by more than 2.5 and 4 times, respectively. The type and amount of polymer did not significantly affect the sorption of nitro explosives to polymer/RS-derived biochar. Due to increasing aromaticity of biochar and decreasing carbon residues from the polymer, the effect of the pyrolysis temperature at elevated temperatures was not marked. Surface treatment with acid or an oxidant did not significantly change the sorption capacity, suggesting that polymer residues may be strongly responsible for the enhancement. Possible polymer residues were identified via GC-MS analysis. The toxicity characteristic leaching procedure (TCLP) and Microtox bioassay analyses indicated that polymer/RS-derived biochar did not show possible harmful effects. Our results suggest that polymer/RS-derived biochar can be effectively used as a sorbent to remove nitro explosives both in the natural environment and engineered systems.
Huan Pang
Brown University, Providence, USA
Title: Comparative study of solid state and solution aldol reaction of lithium enolate of pinacolone
Time : 00:00
Biography:
Abstract:
We reported the first systematic study of the solid-state aldol reactions of lithium pinacolone enolate with various aromatic solid aldehydes, in comparison with the same reactions performed in tetrahydrofuran (THF) solution. In solution, the reactions are selective with the aldol condensation product, except for the reaction involving 2-nitrobenzaldehyde. In the solid state, the reactions with THF-solvated lithium enolate of pinacolone showed the mixture of aldol condensation and aldol addition products. The usage of unsolvated lithium enolate of pinacolone in the solid state reactions resulted in a higher ratio of aldol addition to aldol condensation product than THF-solvated lithium enolate of pinacolone. At lower temperatures (0 °C), the solid state reactions can afford a higher ratio of aldol addition to aldol condensation product in the system. The solid-state reactions generally afforded low yields and low conversion of the aldehydes. For those aldehydes with halogen group on the para position of benzaldehyde, the Tishchenko product was formed in a large amount in the system catalyzed by lithium enolate of pinacolone (as the strong base).
Marise Garcia Batlle
National Autonumous University of Mexico, Mexico
Title: Synthesis of radiolabeled aromatic bisphosphonates and their potential application in bone metastasis pain palliation.
Time : 00:00
Biography:
Abstract:
Introduction: Bone metastases are the most frequent complication in the 80% of patients in advanced oncological stages. They are usually incurable, produce severe pain, decreasing the expectancy and quality of life of patients. Bisphosphonates are the main compounds employed for that purpose; nevertheless, their synthesis is relatively a complex process. The aim of the present work was to develop a simple synthesis method of aromatic bisphosphonates, potentially useful to alleviate metastatic bone pain, from their respective amino acids.
Materials and Methods: L-phenylalanine was used as starting material. The synthesis had three stages: 1) Protection of the amino group with a 1: 1 mixture of formic acid (98%) and acetic anhydride; 2) phosphonation of the protected phenylalanine with a mixture of H3PO3 and PCl5; 3) hydrolysis. The sodium salt of the 2-amino-3-phenyl-1-hydroxypropyl-1,1-bisphosphonic acid and the iodinated derivative thereof was obtained. The compounds obtained were characterized by infrared spectroscopy, 1H-NMR, 13C-NMR. The iodogen method was used for the labeling of the sodium salt obtained with 125I.
Results: The yield of the protection reaction of the amino group ranged between 75 and 80% and that of the phosphonation between 50 and 60%. All the compounds were obtained with a suitable purity evaluated by spectroscopic techniques.
Conclusions: A synthesis method was developed with novel modifications that allowed to obtain, both the sodium salt of the 2-amino-3-phenyl-1-hydroxypropyl-1,1-bisphosphonic acid, as well as the iodinated derivative thereof from the L -phenylalanine.
Ganesh N Y
Govt. Science College, Visvesvarayya Technological University, India
Title: Green Synthesis of Pyrazolo-Pyrimidines by using Ionic Liquids as potent EAC receptor antagonists.
Time : 00:00
Biography:
Abstract:
Pyrazolo-Pyrimidines are Heterocycles having nitrogen based hetero atom which is the main composition to exhibit pharmacological efficacy. Since they resemble purine, have a great role in the field of medicinal chemistry. After thorough literature survey, we planned to synthesize the new compounds of Pyrazolo-Pyrimidines by different synthetic methodology followed the green chemistry approach. Here we reported one pot syntheses of Pyrazolo-Pyrimidines by using Ionic liquids & studied comparative with Nano-catalysts (Not named here). We found the Ionic liquids that used, are better for the synthesis by affording more yield & higher quality than nano-catalysts. The synthesized compounds were confirmed by 1HNMR, IR & C13NMR spectra. The compounds were tested for in-vitro anticancer activity against Ehrlich Ascites Carcinoma (EAC) cell line. Most compounds revealed significant anticancer activity relative to doxorubicin as positive control with IC50 values.
Huan Pang
Brown University, Providence, USA
Title: Comparative study of solid state and solution aldol reaction of lithium enolate of pinacolone
Biography:
Abstract:
We reported the first systematic study of the solid-state aldol reactions of lithium pinacolone enolate with various aromatic solid aldehydes, in comparison with the same reactions performed in tetrahydrofuran (THF) solution. In solution, the reactions are selective with the aldol condensation product, except for the reaction involving 2-nitrobenzaldehyde. In the solid state, the reactions with THF-solvated lithium enolate of pinacolone showed the mixture of aldol condensation and aldol addition products. The usage of unsolvated lithium enolate of pinacolone in the solid state reactions resulted in a higher ratio of aldol addition to aldol condensation product than THF-solvated lithium enolate of pinacolone. At lower temperatures (0 °C), the solid state reactions can afford a higher ratio of aldol addition to aldol condensation product in the system. The solid-state reactions generally afforded low yields and low conversion of the aldehydes. For those aldehydes with halogen group on the para position of benzaldehyde, the Tishchenko product was formed in a large amount in the system catalyzed by lithium enolate of pinacolone (as the strong base).