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      https://www.ias.ac.in/article/fulltext/jcsc/121/04/0377-0385

    • Keywords

       

      Heteropolyoxotungstate; oxidation; hydrogen peroxide; pyridine; sulfide; aqueous-biphasic.

    • Abstract

       

      A series of water soluble Keggin type heteropolyoxotungstates have been tested as oxidation catalysts in aqueous-biphasic media with dilute H2O2 (30%) as the oxygen atom donor, without using any phase transfer agent. The Zn substituted polyoxoanion {(NH4)7Zn0.5[𝛼-ZnO4W11O30ZnO5(OH2)]$.n$H2O} 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.

    • Author Affiliations

       

      Prasenjit Maity1 Double Mukesh2 Sumit Bhaduri3 Goutam Kumar Lahiri1

      1. Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076
      2. Department of Biotechnology, Indian Institute of Technology Madras, Chennai 600 036
      3. Reliance Industries Limited, Swastik Mills Compound, V.N. Purav Marg, Chembur, Mumbai 400 071
    • Dates

       
  • Journal of Chemical Sciences | News

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