The reaction of dialkylaluminium chlorides with bis(trimethylsilyl) hydrazine: Formation of the adducts R2AlCl center dot NH2NHSiMe3 containing the unstable monotrimethylsilylhydrazine

Bis(trimethylsilyl)hydrazine did not react with dialkylaluminium chlorides R2AlCl [R = CH2CMe3, CMe3 and CH(SiMe3)(2)] by the formation of trimethylch lorosilane, but by dismutation to yield tris(trimethylsilyl)hydrazine and t rimethylsilylhydrazine. The unstable, sterically less shielded NH2NHSiMe3 w as stabilized by the coordination to the coordinatively unsaturated alumini um compounds. The adducts R2AlCl . NH2NHSiMe3 were formed, which were chara cterized by crystal structure determinations with R = CMe3 and CH(SiMe3)(2) . In all cases, the hydrazine derivative binds to the aluminium atoms via t he more basic NH2 nitrogen atom. The adduct Me3CAlCl2 . NH2N(SiMe3)(2) cont aining intact 1,1-bis(trimethylsilyl)hydrazine as a ligand was isolated in a trace amount and also characterized by a crystal structure determination.