Facile Generation of Aluminum 1,2-Dihydropyridyl and Hydroxyl Derivatives from an Aluminum Cyclopropene Analogue

Reaction of LAl(η2-Me3SiC2SiMe3) (1; L = HC[(CMe)(NDipp)]2, Dipp = 2,6-iPr2C6H3) with pyridine afforded the (1,2-dihydropyridyl)aluminum species LAl[C2(SiMe3)2CHN(C4H4)] (2), having an AlC3N five-membered ring, as a major product via insertion into one of the Al−C bonds, while hydrolysis of 1 at low temperature resulted in ring cleavage to yield the monomeric aluminum alkenyl hydroxide LAl(OH)[C(SiMe3)CH(SiMe3)] (3). The molecular structures of 2 and 3 were determined by X-ray single-crystal analysis.