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The kinetics of nucleophilic substitution of dimethylsulfoxide by chloride ion in bis-dimethyl sulfoxide dimethyltin(IV) dichloride and bis-dimethyl sulfoxide diphenyltin(IV) dichloride in micellar microenvironment (1.0 × 10 –2  M SDS in aqueous solution of ethanol (1:1, v/v) has been studied conductometrically. The reactions have been carried out at 25°C. Substitution follows first order path with respect to chloride ion concentration. A millimolar solution of the complexes in ethanolic solution of 1.0 × 10 –2  M SDS shows an increase in conductance with time due to solvation of the molecule. Sn(CH 3 ) 2 Cl 2  · 2 DMSO shows high conductance as compared to Sn(C 6 H 5 ) 2 Cl 2  · 2 DMSO. In the presence of the nucleophilic reagents, C 6 H 5 COCl and CH 3 COCl there is a greater enhancement in conductance due to substitution of DMSO by chloride ion. The data of rate constant for solvation (K S ) and for nucleophilic substitution (K 1  and K 2 ) have been calculated. It was found that the solvation is a slower process compared to the substitution by chloride ions i.e., K 1 , K 2  &gt; Ks. A possible mechanism has been suggested.

Kinetics and Mechanism of Nucleophilic Substitution in SnR 2 Cl 2 · 2DMSO by Chloride Ions in Micellar Microenvironment