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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/10054/8545

Title: A water soluble heteropolyoxotungstate as a selective, efficient and environment friendly oxidation catalyst
Authors: MAITY, P
MUKESH, D
BHADURI, S
LAHIRI, GK
Keywords: 30-percent hydrogen-peroxide
organic solvent-free
recyclable catalyst
aerobic oxidation
benzoic-acids
polyoxometalate
alcohols
molybdenum
sulfoxides
sulfides
Issue Date: 2009
Publisher: INDIAN ACAD SCIENCES
Citation: JOURNAL OF CHEMICAL SCIENCES, 121(4), 377-385
Abstract: A series of water soluble Keggin type heteropolyoxotungstates have been tested as oxidation catalysts in aqueous-biphasic media with dilute H(2)O(2) (30%) as the oxygen atom donor, without using any phase transfer agent. The Zn substituted polyoxoanion {(NH(4))(7)Zn(0.5)[alpha-ZnO(4)W(11)O(30)ZnO(5)(OH(2))]center dot nH(2)O} has been found to be the most efficient catalyst, which oxidizes a wide range of organic functionalities with good turnovers and high selectivities. The functionalities that undergo oxidations are: organic sulfides, pyridines, anilines, benzyl alcohols and benzyl halides. The oxidations of sulfides to sulfoxides and/or sulfones have been studied in detail, and a simple kinetic model consisting of two consecutive reactions, is shown to give good fit with the experimental data. In the catalytic system described here product isolation is easy, and the aqueous catalyst solution can be re-used several times with little loss in its efficiency.
URI: http://dspace.library.iitb.ac.in/xmlui/handle/10054/8545
http://hdl.handle.net/10054/8545
ISSN: 0253-4134
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