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|Title:||Anodically generated manganese (III) sulphate for the oxidation of aldo and keto hexoses: A kinetic and mechanistic study|
Rangappa, K S
Rai, K M Lokanatha
|Abstract:||Kinetics of the oxidation D-glucose, D-fructose, D-mannose and L-sorbose by manganese (III) have been studied in the presence of sulphate ions in acidic medium at 32 °C. The reaction has been followed spectrophotome trically at λmax = 500nm. A first order dependence of the rate on both Mn (III) and the hexose concentrations is observed. The rate is independent of the concentration of reduction product Mn(II) and hydrogen ions. Effects of varying dielectric constant of the medium and addition of anions such as sulphate, flouride, chloride and perchlorate have been investigated. Activation parameters have also been evaluated using Arrhenius and Eyring plots. A mechanism involving the formation of enediol from hexoses which reacts with Mn (III) in the rate limiting step is suggested.|
|Appears in Collections:||IJC-B Vol.38B(09) [September 1999]|
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