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Cr(VI)-4-(dimethylamino)pyridine[4-(dimethylamino)pyridinium chlorochromate] was synthesized by the reaction of 4-(dimethylamino)pyridine with chromium trioxide in 6M-HCl, and characterized by IR, ICP. The oxidation of benzyl alcohol using 4-(dimethylamino)pyridinium chlorochromate in various solvents showed that the reactivity increased with the increase of the dielectric constant(e), in the order: cyclohexene  chloroform  acetone  N,N-dimethylformamide. In the presence of hydrochloric acid (H 2 SO 4 solution), 4-(dimethylamino)pyridinium chlorochromate oxidized benzyl alcohol and its derivativ- es(p-OCH 3 , m-CH 3 , H, m-OCH 3 , m-Cl, m-NO 2 ) smoothly in DMF. Electron-donating substituents accelerated the reaction, whereas electron acceptor groups retarded the reaction. The Hammett reaction constant(ρ) was -0.68(303K). The observed experimental data was used to rationalize the hydride ion transfer in the rate-determining step. Key Words : substituted benzyl alcohol, Hammett reaction constant(ρ), hydride ion transfer, rate-determining step.

A Study for Kinetics and Oxidation Reaction of Alcohols by Cr(VI)-4-(Dimethylamino)pyridine