Kinetic Investigations on Pd(II) Catalyzed Oxidation of Some Amino Acids by Acid Bromate
Keywords: Acidic medium, mercuric acetate, Pd catalyst, potassium bromated
AbstractKinetic investigations on Pd(II) 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. The rate shows zero order kinetics in bromate [BrO3‾] and order of reaction is one with respect to substrate and Pd(II) 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. Palladium chloride [PdCl2] being reactive species of Palladium (II) 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.
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