STUDY OF THE REDISTRIBUTION REACTION OF TETRAMETHYLTIN WITH DIMETHYLTIN DICHLORIDE IN SEVERAL APROTIC SOLVENTS.

Article abstract of DOI:10.1246/bcsj.56.2555

The redistribution reaction of tetramethyltin with dimethyltin dichloride was studied in eight aprotic solvents by using the **1H NMR technique. The second-order rate constant of the reaction (ln k//2) is proportional to the dielectric constant of the solvent. There is a weak relation between the rate constants (ln k//2) and the values of **2J(Sn-H) of Me//2SnCl//2 in several solvents, which are considered to be related to the coordination ability of the solvents. The rate constants are also related to Kosower's Z values of the solvents. The activation entropies of the reaction in four typical solvents have large negative values. This predicts that the reaction proceeds via a four-center transition state.