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Kinetics of oxidation of indole by peroxomonosulphate (PMS) in aqueous acetonitrile medium has been inves- tigated. The reaction follows a total second order, first order each with respect to (Indole) and (PMS). The rate of the reaction was not affected by added (H + ). Variation of ionic strength (µ) had no influence on the rate. Increase of percentage of acetonitrile decreased the rate. Absen ce of any polymerization indicated a nonradical pathway. Activation and thermodynamic parameters have bee n computed. A suitable kinetic scheme based on these observations is proposed. The reactivity of PMS towards Indole was found to be higher than that with peroxodisulphate.

A Kinetic Study on the Oxidation of Indole by Peroxomonosulphate in Acetonitrile Solvent