Pd(II) catalysis in oxidation of D-ribose and arabinose by chloramine-T in acidic medium: A kinetic study

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Kinetic investigations on Pd(II) catalyzed oxidation of D-ribose and D-arabinose by acidic solution of chloramine-T in the presence of mercuric acetate, as a scavenger have been made in the temperature range of 30°-45°C. The rate shows first order kinetics in case of chloramine-T and order of reaction is zero and 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 chloramine-T. PdCl2 being the reactive species of Palladium(II) chloride, 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.

Pd(II) chloride; Chloramine-T; D-Ribose and D-Arabinose