Kinetics and Mechanism of Oxidation of 1,2-Butanediol or Mephenesin by Ditelluratocuprate(III) in Alkaline Media

Chemical Research in Chinese Universities ›› 2011, Vol. 27 ›› Issue (6): 1041-1044.

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Kinetics and Mechanism of Oxidation of 1,2-Butanediol or Mephenesin by Ditelluratocuprate(III) in Alkaline Media

SHAN Jin-huan*, LIU Yan-ping and FENG Shu-xia

College of Chemistry and Environmental Science, Hebei University, Baoding 071002, P. R. China

Received:2011-01-06 Revised:2011-03-22 Online:2011-11-25 Published:2011-11-07
Contact: SHAN Jin-huan E-mail:shanjinhuaner@yahoo.com.cn
Supported by:
Supported by the Natural Science Foundation of Hebei Province, China(No.295066).

Abstract

Abstract: The kinetics of the oxidation of 1,2-butanediol or mephenesin by ditelluratocuprate(III)(DTC) was investigated spectrophotometrically at temperatures between 283.2―303.2 K in alkaline media. The reaction rate showed first order dependence in DTC and fractional order in 1,2-butanediol or mephenesin. It was shown that the pseudo- first-order rate constant kobs increased with an increase in concentration of OH– and a decrease in concentration of TeO42–. The reaction has a negative salt effect. A plausible mechanism of reaction involving a pre-equilibrium of adduct formation between the complex and 1,2-butanediol or mephenesin was proposed. The rate equations derived from the mechanism can explain all the experimental phenomena. The activation parameters for the rate-determining step were also calculated.

Key words: Ditelluratocuprate(III)(DTC), 1,2-Butanediol, Mephenesin, Kinetics, Mechanism

SHAN Jin-huan*, LIU Yan-ping and FENG Shu-xia. Kinetics and Mechanism of Oxidation of 1,2-Butanediol or Mephenesin by Ditelluratocuprate(III) in Alkaline Media[J]. Chemical Research in Chinese Universities, 2011, 27(6): 1041-1044.

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Kinetics and Mechanism of Oxidation of 1,2-Butanediol or Mephenesin by Ditelluratocuprate(III) in Alkaline Media

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