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Kolkata, India

Roy S.,Basanti Devi College | Bhar S.,Jadavpur University
Green Chemistry Letters and Reviews | Year: 2010

Synthesis of structurally varied β-arylvinyl bromides has been accomplished in an eco-friendly "On-water" condition through bromodecarboxylation reaction of appropriately substituted cinnamic acids with potassium bromide using hydrogen peroxide as oxidant and sodium tungstate as catalyst.Salient mechanistic features have also been highlighted. © 2010 Taylor & Francis. Source

Chaudhuri S.K.,Khorop High School | Roy S.,Basanti Devi College | Bhar S.,Jadavpur University
Beilstein Journal of Organic Chemistry | Year: 2012

An efficient solvent-free protocol for regioselective bromination of substituted coumarins has been developed by using dioxane dibromide as the solid brominating agent. The efficacy of the solvent-free protocol has been established. The effects of the electronic nature and location of the substituents on the outcome of the reaction have been rationalized with a proposed mechanism. © 2012 Chaudhuri et al. Source

Chatterjee S.,Basanti Devi College | Roy B.,University of Calcutta | Roy D.,University of Calcutta | Banerjee R.,University of Calcutta
Polymer Degradation and Stability | Year: 2010

Extruded low-density polyethylene (LDPE) films commonly available in the market as 20-micron thick carrier bags were autoclaved, overlaid on nutrient agar plates and inoculated with BP/SU1 strain of Staphylococcus epidermis. The nutrient agar plate showed growth of the organism within two to three days. The polymer film supporting the growth of the organism showed pore formation as recorded by SEM analysis. The growth of BP/SU1 is supported by the presence of shredded LDPE as its only carbon source in inorganic salt minimal nutrient medium. The organism survives even after three months of inoculation and this is accompanied by gradual breakdown of the size of the shredded plastic as seen by light scattering. The cell-free supernatant of the organism, grown with the help of shredded plastic shows the presence of the over expressed proteins with approximate molecular weight of about 55 kDa and 35 kDa, through SDS-PAGE analysis. © 2009 Elsevier Ltd. Source

Khan S.,Jadavpur University | Roy S.,Basanti Devi College | Roy R.,Jadavpur University | Ghatak A.,Jadavpur University | And 2 more authors.
Tetrahedron Letters | Year: 2014

Differently substituted cyclopropylcarbinols underwent ring cleavage with easily accessible cyanuric chloride-N,N-dimethylformamide adduct to produce homoallylic chlorides or dienes depending on the nature and location of the substituents. A mechanistic explanation of the aforesaid observations has been provided. A promising antioxidant compound was prepared following this protocol and studied against Fenton's reagent. This methodology was utilized to construct hitherto unreported vinylcyclopropane frameworks bearing homoallylic chloride and diene moieties. © 2014 Elsevier Ltd. All rights reserved. Source

Sen G.K.,Jadavpur University | Das M.,Jadavpur University | Chatterjee M.,Basanti Devi College
Ecology, Environment and Conservation | Year: 2010

The Regional Ocean Model System (ROMS) driven by NCEP reanalyzed forcing fields together with QuickScatt wind observations, has been used to study evolution of surges in the Northern Bay of Bengal (adjacent to West Bengal Coast of India ) due to Cyclone AILA ( 24-25 May 2009 ). The model was, very consistent and able to simulate basic sea level variation very well. A comparison with observation at aparticular location (near Digha) was also provided. The results show that ROMS model is robust enough to reproduce surge impact very consistently. Copyright © Enviromedia. Source

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