The kinetics of oxidation of methyl phenyl sulphide (MPS) by imidazolium fluorochromate (IFC) in acetonitrile-water (1:1) mixture at 303 K in presence of perchloric acid was followed spectrophotometrically at 360 nm. The reaction was carried out under pseudo first order conditions ([MPS] >> [IFC]). The reaction was first order each in MPS and IFC and fractional order in H +. Also it has been found that the reaction was not affected by ionic strength of medium changed by altering the concentration of the sodium perchlorate. However increase in the acetonitrile content of the medium increases the rate of the reaction. These observations were well analyzed in favour of a S N 2 type of mechanism.

Kinetics of oxidation of aniline by N-bromophthalimide (NBP) in acetonitrile-water solvent mixture at 303 K in the presence of perchloric acid has been followed iodometrically. The reaction is first order with respect to both aniline and NBP and is catalyzed by H + ion and the order of the reaction with respect to [H + ] is also one. It has been found that the reaction rate is not affected by changes in ionic strength of the reaction medium or by the addition of acrylonitrile and potassium bromide. However, addition of phthalimide causes a decrease in the rate of reaction. An increase in the water content of the solvent mixture decreases the rate of reaction. Thermodynamic and activation parameters have also been evaluated.