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Kinetics and mechanism of the oxidation of some α-hydroxy acids by tetrachloroaurate(III) in acetic acid-sodium acetate buffer medium

✍ Scribed by Kalyan K. Sen Gupta; Biswajit Pal; Pratik K. Sen

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
200 KB
Volume
31
Category
Article
ISSN
0538-8066

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✦ Synopsis

The kinetics of oxidation of some neutralized ␣-hydroxy compounds such as glycolic (GA), lactic (LA), ␣-hydroxyisobutyric(IB), mandelic (MA), atrolactic (AL), and benzilic (BA) acids by tetrachloroaurate(III) have been studied. The substrates are oxidized to give formaldehyde, acetaldehyde, acetone, benzaldehyde, acetophenone, and benzophenone for the respective reactions. The rate of the reaction increases with increasing [substrate] and pH but decreases with increase in [Cl Ϫ ]. Temperature influence is quite marked in all these reactions. A mechanism involving the formation of an unstable complex, which decomposes to give the respective reaction products, is proposed. The reactivity of the ␣-hydroxy acids towards gold(III) are as follows:

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