Bs College

Canning, India

Bs College

Canning, India
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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.


PubMed | Kalyani University, University of Calcutta, Indian Association for The Cultivation of Science and Bs College
Type: | Journal: Journal of colloid and interface science | Year: 2015

A graphene based composite with gold nanoparticles has been synthesized via a simple chemical route and the structure and compositions of nanocomposite has been characterized. The catalyst was found to be remarkably stable and active for the oxidative esterification of alcohols under present reaction conditions using molecular oxygen as green oxidant and Suzuki cross-coupling reactions between aryl halides and phenylboronic acids using environmentally friendly water as solvent. The versatility of both the protocols was demonstrated by taking a number of substrates. This protocol offers several advantages like high yields, clean reactions, recyclability of the catalyst, reaction in water and use of green oxidant. This study suggests graphene, as an economical substitute for carbon nanotubes, could act as a prominent support in heterogeneous catalysis.


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.


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.


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.


Islam S.M.,Kalyani University | Mondal S.,Kalyani University | Mondal P.,Kalyani University | Roy A.S.,Kalyani University | And 3 more authors.
Journal of Organometallic Chemistry | Year: 2012

A simple and industrially viable protocol for C-N and C-O coupling was reported here. The polymer supported heterogeneous copper catalyst was prepared from chloromethyl polystyrene using a simple procedure. O-Arylation of substituted phenols with various aryl halides was achieved using this copper catalyst in DMSO medium. This heterogeneous copper catalyst, also efficiently works for the N-arylation of N-H heterocycles with aryboronic acids in methanol. This catalyst was also effective in amination reaction of primary amines with aryl halides as well as arylboronic acids in DMSO medium. The effects of solvent, base and temperature for the O-Arylation and amination reactions were reported. Further, the catalyst can be easily recovered quantitatively by simple filtration and reused up to several times without sufficient loss of its catalytic activity. © 2011 Elsevier B.V. All rights reserved.


Islam S.M.,Kalyani University | Mondal P.,Kalyani University | Tuhina K.,Bs College | Roy A.S.,Kalyani University | And 2 more authors.
Journal of Inorganic and Organometallic Polymers and Materials | Year: 2010

A new polymer-anchored Pd(II) complex has been synthesized, characterized and its catalytic activity was investigated for the Suzuki cross-coupling reaction between aryl halides and arylboronic acid in the presence of K 2CO 3 as a base, for Heck olefination of aryl halides with alkenes, and for cyanation reaction of aryl iodides with K 4Fe(CN) 6 in presence of Et 3N as base. The key features of the catalyst include rapid reactions with excellent conversion without the use of phosphine ligands and total stability under the reactions conditions. The catalyst was recovered by simple filtration and reused five-times without significant loss of catalytic activity. © 2010 Springer Science+Business Media, LLC.


Islam S.M.,Kalyani University | Mondal S.,Kalyani University | Mondal P.,Kalyani University | Roy A.S.,Kalyani University | And 2 more authors.
Inorganic Chemistry Communications | Year: 2011

The Ullmann coupling of amines with aryl iodide as well as arylboronic acids and N(H)-heterocycles with arylboronic acids has been carried out efficiently using PS-LCu(I) catalyst. The copper complex has been prepared and characterized by using scanning electron microscope (SEM), elemental analysis, atomic absorption spectroscopy (AAS), Thermo gravimetric analysis and spectrometric methods like Fourier transform infrared spectroscopy (FTIR). The effects of various parameters such as temperature, solvent and base on the reaction system were studied. The reusability experiments show that the catalyst can be used five times without much loss in the catalytic activity. © 2011 Elsevier B.V. All rights reserved.


Molla R.A.,Kalyani University | Ghosh K.,Kalyani University | Tuhina K.,Bs College | Manirul Islam Sk.,Kalyani University
New Journal of Chemistry | Year: 2015

A new polymer supported Cu(II) complex has been synthesized and characterized. The catalytic performance of the complex has been tested for the direct conversion of benzylic alcohols to aryl nitriles. In this reaction ammonium formate was used as the nitrogen source and O2 as the oxidant. Furthermore, the copper-catalyzed one-pot synthesis of primary aryl amides from alcohols was also achieved. The effects of solvents, reaction time and catalyst amount for the aryl nitriles and aryl amides synthesis were reported. This catalyst showed excellent catalytic activity and recyclability. The polymer supported Cu(II) catalyst could be easily recovered by filtration and reused more than five times without appreciable loss of its initial activity. © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2015.


Islam S.M.,Kalyani University | Molla R.A.,Kalyani University | Roy A.S.,Kalyani University | Ghosh K.,Kalyani University | And 3 more authors.
Journal of Organometallic Chemistry | Year: 2014

Polymer anchored oxovanadium catalyst was synthesized and characterized. Its catalytic activity was evaluated for the oxidation of various primary and secondary alcohols with molecular oxygen under mild reaction conditions. This catalyst was also effective for the oxidative bromination reaction of organic substrates with 90-100% selectivity of mono substituted products with H 2O2/KBr at room temperature. The above reactions require low temperature, short time period and most importantly all the above reactions occur in aqueous medium. The developed catalyst can be facilely recovered and reused six times without significant decrease in activity and selectivity. ©2014 Elsevier B.V. All rights reserved.

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