t-Butylberyllium-alkyls and -aryls: amine complexes and pyrolysis to hydrides

Abstract

Dimethylberyllium dissolves in di-t-butylberyllium giving the liquid trimer (Bu^tBeMe)₃. Other t-butylberyllium alkyls and aryls prepared are the dimers (Bu^tBeR)₂, R = Et, o-tolyl, and p-xylyl. The cyclopentadienyl derivatives, C₅H₅BeR (R = Bu^t or C₆F₅), are monomeric. Pyrolysis of Bu^tBeR (R = Me, o-tolyl, and m-tolyl) yields the benzene-insoluble hydrides, RBeH, characterized as amine complexes.

The NNN′N′-tetramethylethylenediamine (tmed) complexes of Bu^tBeR (R =o- and p-tolyl or C₆F₅) are described. Other complexes prepared include (Me₃SiCH₂)₂Be,tmed, (o-tolyl)₂Be, quinuclidine, and the tetrahydrofuran complexes of di-t-butylberyllium and of bispentafluorophenylberyllium. t-Butylberyllium chloride is insoluble in benzene, but can be sublimed; its quinuclidine complex is insoluble in benzene.