Propyl- and t-butyl-beryllium complexes

Abstract

Ether-free beryllium dialkyls, R₂Be (R = Et, Prⁿ, Buⁿ, Buⁱ), can be obtained by prolonged boiling of the ether complexes under reflux at low pressure. All the above ether-free dialkyls are dimeric in benzene solution. The temperature-dependence of the ¹H n.m.r. Spectra of some of them is described. The halides Bu^tBeX, OEt₂(X = Cl, Br) are dimeric in benzene, and the chloride is monomeric in diethyl ether. 1 : 1 Complexes between di-t-butylberyllium and MMe₃(M = N, P) are described. The ¹H n.m.r. spectrum of the 1 : 1 complex of tetramethylethylenediamine with Prⁱ₂ Be does not change with temperature, in contrast to that of the Bu^t₂Be complex. The complexes Bu^tBeOC₂H₄NMe₂, PrⁿBeNMeC₂H₄NMe₂, PrⁱBeNMeC₂H₄NMe₂, and Bu^tBeSC₂H₄NMe₂ are dimeric in benzene solution, as is MeZnSC₂H₄NMe₂.