Kinetics and Mechanism of Oxidation of D-Glucose by Quinolinium Chlorochromate (QCC) in Aqueous Acetic Acid Medium

摘要

The kinetic and mechanism of the oxidation of D-glucose by quinolinium chlorochromate, C_9H_7-NH[CrO_3Cl], has been studied in aqueous acetic acid medium in the presence of perchloric acid at constant ionic strength. The reaction has been found to be first order with respect to both the [oxidant] and [substrate] under pseudo-first order conditions. The reaction is acid catalysed and the effect of [NaClO_4] is negligible. With an increase in the amount of acetic acid in its aqueoux mixture, the rate increases. A 1:1 stoichiometry is observed in the oxidation and the reaction did not induce polymerisation of acrylonitrile. The various activation parameters are calculated from the Arrhenius plot. A mechanism involving direct hydride ion transfer has been proposed.