Probing the ground-State δ effect of group 14 metal substituents. X-ray structures of cis- and trans-4-trimethylmetal-substituted cyclohexyl p-nitrobenzenesulfonates

Abstract

Accurate low-temperature X-ray structural studies on trans-4-trimethylsilylcyclohexyl p-nitrobenzene-sulfonate (31) and cis- and trans-4-trimethylstannylcyclohexyl p-nitrobenzenesulfonates (32) and (33) failed to demonstrate the presence of any significant structural effects due to a σM-C-σC-Cσ*C-O through-bond interaction between the C-M σ donor orbital and the σ* C-ONs acceptor orbital.