OXIDATION OF DIMETHYLSUPHOXIDE BY SODIUM N-BROMOBENZENESULPHONAMIDE: A KINETIC AND MECHANISTIC STUDY

Article abstract of DOI:10.1016/S0040-4020(01)91116-0

The kinetics of oxidation of dimethylsulphoxide (DMSO) by sodium N-bromobenzenesulphonamide or bromamine-B (BAB) has been studied in HClO₄, HCl and NaOH media, at 35 deg C, with OsO₄ as a catalyst in the latter medium.In acid medium, the rateshows a first order dependence on and second order in +>, but is independent of substrate concentration.Alkali retards the reaction (inverse first order) and rate is independent of oxidant concentration, but shows fractional order in and depends on 4>².The solvent isotope effect was studied by using D₂O.Activation parameters have also been determined.Mechanisms pro posed and the derived rate laws are consistent with the observed kinetics.