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Islam M.,Kalyani University | Mondal S.,Kalyani University | Mondal P.,Kalyani University | Roy A.S.,Kalyani University | And 5 more authors.
Catalysis Letters | Year: 2011

Polymer supported Cu(II) catalyst was prepared, characterized and employed for the N-arylation and amination reaction of N-H heterocycles with aryl halides as well as arylboronic acids to afford the corresponding coupled products in good to excellent yields. This catalyst can be used several times with consistent catalytic activity. © 2011 Springer Science+Business Media, LLC. Source


Islam S.M.,Kalyani University | Roy A.S.,Kalyani University | Mondal P.,Kalyani University | Tuhina K.,Bs College | And 2 more authors.
Tetrahedron Letters | Year: 2012

A new polymer-anchored Cu(II) complex has been synthesized and characterized. The catalytic performance of the complex has been tested for the oxidation of sulfides and in oxidative bromination reaction with hydrogen peroxide as the oxidant. Sulfides have been selectively oxidized to the corresponding sulfoxides in excellent yields and in the presence of KBr as the bromine source, organic substrates have been selectively converted to mono bromo substituted compounds using polymer-anchored Cu(II) catalyst. This catalyst showed excellent catalytic activity, high selectivity, and recyclability. The polymer-anchored Cu(II) catalyst could be easily recovered by filtration and reused more than five times without appreciable loss of its initial activity. © 2011 Published by Elsevier Ltd. Source


Islam M.,Kalyani University | Mondal P.,Kalyani University | Roy A.S.,Kalyani University | Tuhina K.,Bs College | And 2 more authors.
Synthetic Communications | Year: 2011

A novel polystyrene-supported palladium(II) complex, an excellent and recyclable catalyst, was synthesized for Sonogashira reactions. The present complex shows high catalytic activity for Sonogashira cross-coupling reaction of aryl halides with phenylacetylene under phosphine-free and copper-free reaction conditions in aqueous (DMF-H2O)medium.The catalyst could be reused for at least six reaction cycles with almost unchanged catalytic properties. © Taylor & Francis Group, LLC. Source


Sahoo P.K.,Birla Institute of Technology and Science | Goit D.,Bs College | Xulu S.S.,University of Zululand | Prasad A.,Dn College | Prasad R.,Ls College
Chinese Physics Letters | Year: 2015

We calculate the energy distribution associated with a static spherically symmetric non-singular phantom black hole metric in Einstein's prescription in general relativity. As required for the Einstein energy-momentum complex, we perform the calculations in quasi-Cartesian coordinates. We also calculate the momentum components and obtain a zero value, as expected from the geometry of the metric. © 2015 Chinese Physical Society and IOP Publishing Ltd. Source


Molla R.A.,Kalyani University | Roy A.S.,Kalyani University | Ghosh K.,Kalyani University | Salam N.,Kalyani University | And 3 more authors.
Journal of Organometallic Chemistry | Year: 2015

A new polymer supported Ru(III) complex has been synthesized and characterized. The catalytic performance of the complex has been tested for the first time azide-alkyne cycloaddition reaction in water and transfer-hydrogenation reaction of ketones in open air. 1,4-disubstituted-1,2,3-triazoles were obtained in excellent yields from azides and terminal alkynes in aqueous medium in the presence of the above catalyst. Aromatic ketones have been converted to their corresponding alcohols using the polymer supported Ru(III) catalyst. The effects of solvents, reaction time, catalyst amount for the azide-alkyne cycloaddition reaction and transfer-hydrogenation reaction were studied. This catalyst showed excellent catalytic activity and recyclability. The polymer supported Ru(III) catalyst could be easily recovered by filtration and reused more than five times without appreciable loss of its initial activity. There was no evidence of leached Ru from the catalyst during the course of reaction has been observed, suggesting true heterogeneity in the catalytic process. © 2014 Elsevier B.V. All rights reserved. Source

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