Kinetics of oxidation of phenoxyacetic acid by TPCC in aqueousaceticacid medium

The kinetic of oxidation of phenoxyacetic acid and several Para and meta substituted phenoxyacetic acids by tetrakis (pyridine) cobalt (II) chromate (TPCC) in the presence of perchloric acid has been studied in aqueous acetic acid medium. The reaction shows unit order dependence each with respect to oxidant and substrate. The order with respect to hydrogen ion concentration is one. The rate of oxidation increases with increase in the percentage of acetic acid and increase in ionic strength has negligible effect on the rate. The addition of Al3+ ion had a noticeable catalytic effect on the reaction rate. In general, the electron releasing substituent accelerates the rate while electron attracting substituent retards the rate of reaction