Original scientific paper

Linear Free Energy Relationships in the Chromium(VI) Oxidation of Phenols

Krishnamoorthy Gunasekar ; Department of Chemistry, National College, Tiruchirappalli 620 001, India
Kaliyaperumal Anbarasu ; Department of Chemistry, National College, Tiruchirappalli 620 001, India

Abstract

The kinetics of oxidation of phenol by nicotinium dichromate has been studied in 50 % acetic acid-water (v/v) medium. The reaction shows unit order dependence on each, with respect to oxidant and
substrate. The reaction is acid catalysed and the medium of low dielectric constant favours the reaction. Increase in ionic strength has negligible effect on the reaction rate. In general, the electron withdrawing substituents enhance the rate of reaction. From the kinetic data obtained, the activation parameters have been calculated and a plausible mechanism has been proposed in accordance with multiparameter correlation analysis.

Keywords

linear free energy relationships; oxidation; phenols; activation parameters

Hrčak ID:

45628

URI

https://hrcak.srce.hr/45628

Publication date:

20.12.2009.

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