Abstract
Methionine (Met) is a naturally occurring sulphur containing amino acid. The kinetics of oxidation of methionine by tetrahexylammonium bromochromate (THexABC) in various percentage of acetic acid + N,N-dimethylformamide mixture (AcOH + DMF) leads to the formation of corresponding sulphoxide. The reaction is first order each in Met, THexABC and [H+]. The reaction is catalysed by hydrogen ions. The reaction rate have been determined at different percentage of AcOH + DMF mixtures at different temperatures and activation parameters calculated. The reaction does not induce polymerization of acrylonitrile. A suitable mechanism has been proposed.