Collect. Czech. Chem. Commun. 1981, 46, 1132-1140

An investigation of the formation of complexes of n-butyllithium with some electrondonors

Ivan Kmínek, Miroslav Kašpar and Jiří Trekoval

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


The formation of complexes of n-butyllithium with triethyl amine, tetramethylethylenediamine, tetrahydrofuran and dimethoxyethane was investigated by using the GLC analysis of the gas phase over a solution of organometallic compounds and electrondonor and by the vapour pressure osmometry method (VPO) at 303 K in benzene. A simple general reaction scheme was proposed, involving dissociation of BuLi hexamer followed by coordination. The composition of the complex, its concentration and the equilibrium constant of coordinations were determined by GLC. These parameters were used in VPO measurements of the molecular mass of the complexes. With respect to the type of the electrondonor, the main types of the complexes contain one to four molecules of electrondonor.