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Issue 10, 1988
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Kinetics and mechanism of the reduction of dodecatungstocobaltate (III) by D-fructose, D-glucose, and D-mannose: comparison between keto- and aldohexoses

Abstract

The kinetics of reduction of dodecatungstocobaltate (III) by D-fructose, D-glucose, and D-mannose in aqueous media have been investigated. A pseudo-zero-order rate was obtained with the ketose and the reaction was acid-dependent. On the contrary, pseudo-second-order rates were obtained for the aldose reactions. The reactions were catalysed by metal ions in the supporting electrolyte; the cation catalytic order K+ > Na+[gt-or-equal] Li+ observed for aldose oxidation is explained on the basis of electrostatic considerations. A mechanism for the ketose oxidation is offered based on keto–enol tautomerism; the aldose oxidations are explained in terms of a transition state formed via ion-induced dipole bridging.

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Article information


J. Chem. Soc., Perkin Trans. 2, 1988, 1781-1785
Article type
Paper

Kinetics and mechanism of the reduction of dodecatungstocobaltate (III) by D-fructose, D-glucose, and D-mannose: comparison between keto- and aldohexoses

M. Gupta, S. K. Saha and P. Banerjee, J. Chem. Soc., Perkin Trans. 2, 1988, 1781
DOI: 10.1039/P29880001781

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