Carbon-13 NMR studies of exchange in R 3SnER′ n derivatives

Abstract

Carbon-13 NMR data are reported for trimethyltin derivatives containing ER n groups where E  C, Si, Ge, Sn, N, O and S including a series of cyclic amines with ring sizes from three to seven. Coupling constant values for the homologous series of fourth group derivatives give goood correlations with the electronegativity of E. The observation of the two-bond, ¦ 2 J( 119SnE 13C) ¦ couplings only in the derivatives containing bulky R groups is rationalized by a bimolecular exchange of ER n groups in the concentrated solutions studied.