Collect. Czech. Chem. Commun. 1981, 46, 1124-1131

A calorimetric study of the interaction between n-butyllithium and some electrondonors

Ivan Kmínek, Miroslav Kašpar and Jiří Trekoval

Institute of Macromolecular Chemistry, Czechoslovak Academy of Sciences, 162 06 Prague 6


Solvation of n-butyllithium with some ethers and amines was investigated by employing thermometric titration at the initial temperature 303 K. The highest enthalpy changes appear in the reaction of n-butyllithium with dimethoxyethane and N,N,N',N'-tetramethylethylenediamine (ΔH = -48.0 and -51.3 kJ/mol respectively), the lowest are observed in the reaction with diethyl ether and anisole (ΔH = -10.2 and -4.3 kJ/mol respectively). Anomalies in the temperature dependence of these reactions were observed for tetrahydrofuran and dimethoxyethane. The respective entropy changes were calculated for some electrondonors. The replacement of one electrondonor in the complex by another was examined thermometrically.