• Mechanistic investigations of the oxidation of phenethyl alcohols by sodium-N-bromo-benzenesulphonamide in acid medium

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      https://www.ias.ac.in/article/fulltext/jcsc/108/05/0485-0494

    • Keywords

       

      Phenethyl alcohols; bromamine-B; oxidation kinetics; oxidation of phenethyl alcohols

    • Abstract

       

      The kinetics of oxidation of six substituted phenethyl alcohols (X-C6H4-CH2-CH2-OH where X=-H, -Cl, -Br, -CH3, -OCH3 and -NO2) by sodium-N-bromo-benzenesulphonamide or bromamine-B(BAB) in the presence of HCl at 35°C showed that the rate has first-order dependence on [BAB]0 and [H+] and fractional order on [PEA]0 and [Cl]. Ionic strength variations, addition of reaction product of benzenesulphonamide and variation of dielectric constant of the medium have no effect on the rate. The solvent isotope effectk1(H2O)/k1(D2O)⊇0.82. Proton inventory studies have been made in H2O-D2O mixtures. The Hammett plot is biphasic and the reaction constantρ was −3.2 for electron-releasing substituents and −0.34 for electron-withdrawing groups. The activation parameters ΔH#, ΔS# follow an isokinetic relationship.

    • Author Affiliations

       

      H Ramachandra1 D S Mahadevappa2 K S Rangappa2

      1. Department of Chemistry, P E S College of Engineering, Mandya - 571 401, India
      2. Department of Studies in Chemistry, University of Mysore, Manasagangotri, Mysore - 570 006, India
    • Dates

       
  • Journal of Chemical Sciences | News

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