A kinetic and mechanistic study of oxidation of tartaric acid by potassium bromate in perchloric acid medium catalysed by Ru (III)

Kushwaha, Usha; Singh, Amita; Kumar, Anil; Singh, A. K.; Khan, Firoz
June 2012
Journal of Chemical & Pharmaceutical Research;2012, Vol. 4 Issue 6, p3144
Academic Journal
Kinetics and mechanism of the Ru (III) catalysed oxidation of α - hydroxy acid (tartaric acid ) by KBrO3 in perchloric acid medium have been investigated. First order dependence in each [KBrO3] and Ru (III) chloride was observed. The order in Ru (III) was found to be unity and decreasing effect of hydrogen ion concentration on the rate was observed. Variation of the ionic strength and dielectric constant of the medium and addition of Hg (OAc)2 (used as Br- scavenger) had an insignificant effect on the rate of reaction. Activation parameters have also been calculated and reported. A suitable mechanism consistent with the observed kinetic results has been suggested and the related rate law deduced. Glyoxal was detected as end product.


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