Abstract
Oxidation of p-chloromandelic acid by Ce(IV) in H 2SO 4 or HClO 4 solutions takes place in accordance with the equation, C 6H 4CICHOH.COOH + 2Ce(IV) → C 6H 4CICHO + 2Ce(III) + 2H + + CO 2 and in conformity with the empirical rate law, − d[Ce(IV)]/dt= k′[ Ce(IV)][p- chloromandelic Acid] [HSO 4 −]2[H+] Kinetic evidence for complex formation between Ce(IV) and the organic acid was not obtained, but spectrophotometric results show complex formation. Mn(II) catalyzes the reaction. The energy and entropy of activation were found to be 19·8 kcal mole −1 and ∼ 1 cal mole −1 deg −1 respectively. The kinetic results and the possibility of complex formation are discussed in relation to the oxidation of benzilic, glycollic and mandelic acids.
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