Ru(III)AND Ir(III)CATALYSED OXIDATION OF MALIC ACID BY N BROMOSUCCINIMIDE.A COMPARATIVE KINETIC STUDY

摘要

The kinetics and mechanism of Ru(III)and Ir(III)catalysed oxidation of malic acid by N-bromosuccinimide(NBS)have been studied in acidic medium in the presence of mercuric acetate as a scavenger in the temperature range of 30-45deg C.Ru(III)and Ir(III)catalysed reactions follow identical kinetics.The rate shows first order kinetics in [substrate], oxidant [NBS], [Ru(III)] and [Ir(III)], respectively.Increase in [Cl~-] showed positive effect, while negative effect of acetic acid and succinimide was observed.Negligible effect of [H~-], mercuric acetate, and ionic strength was observed.A suitable mechanism in conformity with the observed kinetics is proposed and activation parameters calculated.