Abstract

Pushpanjali Singh*, Roli Raghuvanshi* and Rishi Raghuvanshi

Comparative study on Pd(II) and Ru(III) catalyzed oxidation of dl -serine and dl- threonine by acidic solution of potassium bromate in the presence of mercuric acetate, as a scavenger have been made in the temperature range of 30°-45°C.In case of both catalyst rate shows zero order kinetics in bromate [BrO-3> ] and order of reaction is one with respect to substrate and Pd(II) and Ru(III) respectively.Increase in [Cl- ] showed positive effect, while [H+] showed zero effect. Negligible effect of mercuric acetate and ionic strength of the medium was observed. A transient complex, formed between [PdCl2] and amino acid. [PdCl2] being reactive species of Palladium(II) chloride in 1:1 ratio, disproportionates in a slow and rate determining step while in case of Ru(III) a transient complex, formed between [RuCl6]3- and amino acid. ([RuCl6]3- being reactive species of ruthenium (III) chloride) in 1:1 ratio, disproportionates in a slow and rate determining step various activation parameters have been calculated. A suitable mechanism in agreement with observed kinetics has been proposed.

Palladium(II) Chloride; Ruthanium (III) Chloride; Potassium; bromate; dl-serine; Catalysis

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