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

Autor:	G. P. Panigrahi, Radhasyam Panda
Rok vydání:	1980
Předmět:	Dimethyl sulfoxide Organic Chemistry Inorganic chemistry Kinetics chemistry.chemical_element Sulfoxide Biochemistry Sulfur Medicinal chemistry Transition state Inorganic Chemistry chemistry.chemical_compound Nucleophile chemistry Electrophile Molecule Physical and Theoretical Chemistry
Zdroj:	International Journal of Chemical Kinetics. 12:491-499
ISSN:	1097-4601 0538-8066
DOI:	10.1002/kin.550120705
Popis:	The kinetics of dimethyl sulfoxide (DMSO) oxidation by peroxomonophosphoric acid (PMPA) in aqueous medium at 308 K and I = 0.4 mol/dm3 follow the rate expressions In the pH range from 0 to 2, where k1 and k2 are 5.092 × 10−1 dm3/mol sec and ≃ 0, respectively; in the pH range from 4 to 7, where k2 = 8.127 × 10−3 and k3 = 2.90 × 10−3 dm3/mol sec; and in the pH range from 10 to 13.6, where k4 ≃ 0, and k5 = 3.08 × 10−2 dm3/mol sec. 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 S-type transition states followed by oxygen-oxygen bond fission to form the products.
Databáze:	OpenAIRE
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