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|Title:||Micellar catalysis on the redox reactions of dialkyl sulphides with chromium(VI)|
|Abstract:||Chromium(VI) oxidation of diethyl sulphide (DES), diisopropylsulphide(DPS), di-n-butyl sulphide (DBS) and di-t-butyl sulphide (DTBS) in 99% acetonitrile-1 % water(v/v) follows second order kinetics, first order in each reactant. A mechanism involving the rate determining nucleophilic attack of sulphide on Cr of H2CrO4 followed by fast ligand coupling between O- and S+ to form sulphoxide as the product has been formulated. The anionic surfactant, sodium dodecyl sulphate, catalyses and the cationic surfactant, cetyltrimethylammonium chloride, inhibits the rate of oxidation which is explained by the proposal that the reaction takes place both in aqueous and micellar phases. The catalytic role of H+ and development of positive charge on sulphur due to the electron transfer from sulphide to Cr(VI) favour the reaction in the anionic micelle and disfavour in the cationic micelle.|
|ISSN:||IJC-A Vol.34A(06) [June 1995]|
|Appears in Collections:||IJC-A Vol.34A(06) [June 1995]|
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