No abstract

The kinetics of oxidation of isoleucine withN-bromophthalimide has been studied in perchloric acid medium potentiometrically. The reaction is of first order each in [NBP] and [amino acid] and negative fractional order in [H+]. The rate is decreased by the addition of phthalimide. A decrease in the dielectric constant of the medium increases the rate. Addition of halide ions or acrylonitrile has no effect on the kinetics. Similarly, variation of ionic strength of the medium does not affect the reaction rate. The reaction rate has been determined at different temperatures and activation parameters have been calculated. A suitable mechanism involving hypobromous acid as reactive species has been proposed.

No abstract

No abstract

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.