P. G. Department of Chemistry, Sambalpur University, Burla, Sarnbalpur, Orissa. Manuscript received 18 November 1974; accepted 2 July 1975. The Vanadium(v) oxidation of acetophenone and its substituted derivative has been found to be first order with respect to the oxidant, the substrate and the perchloric acid concentration. No effect of the ionic strength has been observed. The oxidation rate is accelerated with increasing acetic acid content in the reaction mixture. The value of 'r' has been

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... computed to be 4.38 to 5.36 Å depending on the ionic nature of the oxidant. The electron donating group is found to retard the reaction with a rho value of +0.12 at 50°. Leffler's energy -entropy relation is found to be obeyed by this oxidation,