✦ LIBER ✦

Oxidation studies with peroxomonophosphoric acid. II. A kinetic and mechanistic study of dimethyl sulfoxide oxidation in acid and alkaline media

✍ Scribed by G. P. Panigrahi; Radhasyam Panda

Publisher: John Wiley and Sons
Year: 1980
Tongue: English
Weight: 391 KB
Volume: 12
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550120705

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✦ Synopsis

The kinetics of dimethyl sulfoxide (DMSO) oxidation by peroxomonophosphoric acid (PMPA) in aqueous medium a t 308 K and I = 0.4 mol/dm3 follow the rate expressions

In the pH range from 0 to 2, where k l and kz are 5.092 X 10-1 dm3/mol sec and = 0, respectively; in the pH range from 4 to 7, where k2 = 8.127 X lo-" and kn = 2.90 X and dm3/mol sec;

(iii) -

in the pH range from 10 to 13.6, where k4 N 0, and k:, = 3.08 X The reaction is interpreted in terms of mechanisms involving an electrophilic and a nucleophilic attack of the peroxomonophosphoric acid species, respectively, in acid and alkaline regions, on the sulfur atom of the sulfoxide molecule giving rise to SNZ-type transition states followed hy oxygen-oxygen bond fission to form the products. dm3/mol sec.

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