Os(VIII)-catalyzed mechanistic investigation of oxidation of some benzimidazoles by chloramine-T in alkaline medium: A kinetic approach

Oxidative decolorisation of Eriochrome Black T with Chloramine‐T: kinetic, mechanistic, and spectrophotometric approaches

“…Osmium tetroxide is known to be an efficient catalyst in the oxidation of several organic compounds by various oxidants in aqueous alkaline medium . It has been shown that osmium is stable in its +8 oxidation state , and in alkaline solutions the following equilibria exist:…”

“…Research into catalysis is a major field in applied, environmental, and medicinal science. The abundant use of platinum‐metal‐ion‐catalysed reactions in many important industrial processes such as hydrogenation, carboxylation, oxidation, and reduction has created an interest among researchers owing to its significance in understanding the mechanistic chemistry of a particular redox system . The mechanism of catalysis to some extent is complicated by the formation of different intermediate complexes, free radicals, and different oxidation states.…”

“…In recent years, Os(VIII), Ru(III), Rh(III), Pd(II), Pt(IV), and Ir(III) have also been widely used as homogeneous catalysts because these elements demonstrate a strong catalytic influence in many reactions. Some of these systems have proved to be suitable for kinetic analysis . During preliminary kinetic investigations, EBT–CAT redox reactions in alkaline medium were found to be sluggish, but became facile in the presence of a microquantity (10 −5 mol dm −3 ) of osmium tetroxide [Os(VIII)].…”