• Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/jcsc/107/02/0133-0141

    • Keywords

       

      Diols; pyridinium hydrobromide perbromide; kinetics; mechanism; oxidation

    • Abstract

       

      Kinetics of oxidation of five vicinal, four non-vicinal diols, and one of thier monoethers by pyridinium hydrobromide perbromide (PHPB) have been studied. The vicinal diols yield products arising out of the glycol bond fission while the other diols yield hydroxycarbonyl compounds. The reaction is first order with respect to PHPB. Michaelis-Menten type kinetics are observed with respect to the diol. There is no effect of added pyridinium bromide on the reaction. The oxidation of [1,1,2,2-2H4]ethanediol shows the absence of a primary kinetic isotope effect. The values of solvent isotope effect,k(H2O)/k(D2O), at 313K, for the oxidation of ethanediol, propane-1,3-diol and 3-methoxybutan-1-ol are 4·71, 2·17 and 2·23 respectively. A mechanism involving glycol-bond fission has been proposed for the oxidation of the vicinal diols. The other diols are oxidised by a hydride-transfer mechanism as they are monohydric alcohols.

    • Author Affiliations

       

      Dipti Mathur1 Pradeep K Sharma1 Kalyan K Banerji1

      1. Department of Chemistry, J N V University, Jodhpur - 342 005, India
    • Dates

       
  • Journal of Chemical Sciences | News

© 2022-2023 Indian Academy of Sciences, Bengaluru.