Abstract
Kinetics of oxidation of mandelic acid by periodate in presence and absence of OsO4 at pH 10 are reported. Second order dependence is observed in mandelic acid even in the uncatalysed reaction at pH 10 as against unit dependence in glycolic and lactic acids in the oxidations catalysed by OsO4 in alkaline medium. The dependence on OsO4 is unity for the oxidation of mandelic, glycolic and lactic acids. There is zero order dependence in periodate in all the OsO4 catalysed reactions. The oxidation of mandelic acid has also been studied in acid medium. Unit dependence each in the substrate and periodate has been observed in acid medium. All these are rationalised and a suitable mechanism is postulated.
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