Biography
Dr. Bashir Ahmad Dar
Dr. Bashir Ahmad Dar
Govt. Degree College (Boys) Sopore, India
Title: Preparation of HPA-Clay as a Recyclable Heterogeneous Catalyst and its Application for Some Green Organic Chemical Transformations
Abstract: 

Heteropoly acids in pure form are advantageous as catalysts due to their low volatility, low corrosiveness, high acidity, activity and flexibility. But the drawbacks in these homogeneous liquid phase catalysts lie in their low surface area (1–10 m2/g) and the problem of separation from the reaction mixture. To overcome the above mentioned problems to be more effective for catalytic reactions, HPAs are usually impregnated on different porous materials. The type of carrier, its textural and structural properties influence the thermal stability and the catalytic activity of Keggin-type heteropolyacids. 

Clays have been reported to act as catalysts or catalyst supports because of their layer structure, high surface area, pore volume, pore diameter and higher surface acidity1-3. Thus clays can be used as an efficient support for HPAs and it is believed that uniform dispersion of HPAs on porous clay support with high surface area increases the overall acidity and catalytic activity of the composites. High activity of vanadium-containing HPAs and the property of clays as catalyst support prompted us to explore the activity of vanadium substituted TPA supported on clay as a heterogeneous catalyst for the various organic reactions. 

The present work is intended to synthesize clay-supported heteropolyacid as a novel heterogeneous, reusable and inexpensive catalyst. This Keggin-type heteropolyacids (HPAs), typically represented by the formula H8-x [XM12O40], (X = heteroatom, x is its oxidation state and M = addenda atom) have been extensively used in acid catalyzed reactions.4 Vanadium substitution in the Keggin structure enhances the catalytic activity of the HPAs.5 We have used this catalyst for different organic transformations like one pot synthesis of 2,3-dihydro-2- phenylquinazolin-4(1H)-ones, one pot synthesis of β-phosphonomalononitriles and one pot synthesis of dihydropyrimidinones etc. 

This catalyst afforded excellent results in very short reaction times and shows high selectivity for different organic reactions. The catalyst could be recycled and reused several times. The reactions occur at room temperature in presence of small amount of the catalyst. No column purification is required and products can be purified by simple crystallization.

Biography: 
Dr Bashir is presently working as Assistant Professor at Govt. Degree College boys Sopore Kashmir. Previously he was lecturer at University of Kashmir, North campus Baramulla Kashmir. He has also worked as Assistant Professor at Maulana Azad College Aurangabad MaharastraIndia, Senior Project Fellow IIIM Jammu, Senior Research Fellow IIIM Jammu, Junior Research Fellow IIIM Jammu, Junior Research Fellow (IICT Hyderabad), Lecturer (Maulana Azad College, Aurangabad Maharastra India) and Visiting Lecturer (Post Graduate Department of Chemistry, Vasantroa Nayak College, of Science Aurangabad Maharastra India. He has 12 years of experience in teaching and research. Dr Bashir has published more than 50 research papers in highly reputed journal. He has also published some books on different topics of chemistry. He is editor and peer reviewer of many chemistry journals. He has participated in the scientific committee of several conferences and associations and has delivered many invited talks in India and abroad. His research interests involve Green Chemistry, Heterogeneous Catalysis, Organic Chemistry and Environmental Chemistry.