Reactivity of aluminum trialkyls R3Al, diorganoaluminum chlorides R2AlCl (R = Me, Et, t-Bu), and Me2AlH toward Sb(SiMe3)(3): Synthesis and structuralcharacterization of Al-Sb compounds containing sigma or dative bonds

Reactions of Sb(SiMe3)(3) with different aluminum trialkyls, R3Al (R = Me, Et, t-Bu), and diorganoaluminum chlorides, R2AlCl (R = Me, Et, t-Bu), in a 1:1 molar ratio are described. Aluminum trialkyls form simple Lewis acid-ba se adducts, R3Al--Sis(SiMe3)3 (R = Me (1), Et (2), t-Bu (3)). Reactions of Me2AlCl and Me2AlH lead to the six-membered-ring systems cyclo-[Me(Cl)AlSb( SiMe3)(2)](3) (4) and cyclo-[Me2AlSb(SiMe3)(2)](3) (7), while the stericall y more crowded Et2AlCl and t-Bu2AlCl form Lewis acid-base adducts of the ty pe R2AlCl<--Sb(SiMe3)(3) (R = Et (5), t-Bu (6)). The solid-state structures of 2, 6, and 7 were determined by single-crystal X-ray diffraction.