• Spectrophotometric determination of basicities of substituted acetylbiphenyls and biphenyl carboxylic acids

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      https://www.ias.ac.in/article/fulltext/jcsc/093/01/0013-0021

    • Keywords

       

      Basicities; acetylbiphenyls; biphenyl carboxylic acids; Hammett equation; π-electron steric effect

    • Abstract

       

      The basicities of several 2′-, 3′-, and 4′-substituted 4-acetylbiphenyls and biphenyl-4-carboxylic acids have been determined spectrophotometrically in sulphuric acid media at 30°C. The pKBH+ of 3′- and 4′-substituted compounds are correlated by the Hammett equation. The 4′-methoxy group deviates considerably in the Hammett plot. This is attributed to its conjugative interaction with the carbonyl or carboxyl group aided by protonation. Good correlation exists between pKBH+ and σ+. The basicities of 2′-substituted 4-acetylbiphenyls and biphenyl-4-carboxylic acids reaffirm the existence of π-electron steric effect of 2′substituents.

    • Author Affiliations

       

      P Ananthakrishna Nadar1 2 N Kannan1

      1. Department of Chemistry, VHNSN College, Virudhunagar - 626 002, India
      2. Chemistry Department, Anna University, Guindy Campus, Madras - 600 025, India
    • Dates

       
  • Journal of Chemical Sciences | News

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