Substitution at saturated carbon. Part I. Kinetics of the electrophilic substitution of tetraethyltin by mercuric iodide in solvent 96% methanol–4% water

Abstract

The substitution of tetraethyltin by mercuric iodide in solvent 96% methanol–4% water has been shown to proceed by the rate-determining bimolecular reaction, Et₄Sn + Hgl₂→ EtHgl + Et₃Snl. In a subsequent rapid reversible reaction, triethyltin iodide reacts with mercuric iodide in a 1 : 1 molar ratio. Rate coefficients for the rate-determining bimolecular reaction have been determined at 25° and at 40°, and the following activation parameters (at 298°K) calculated: ΔG^‡ 20·6 kcal. mole^–1; ΔH^‡ 11·7 kcal. mole^–1; ΔS^‡–30 cal. deg.^–1 mole^–1.