A thermally stable alane–secondary amine adduct: [H3Al(2,2,6,6-tetramethylpiperidine)]

Abstract

Metallation of 2,2,6,6-tetramethylpiperidine, HN[CMe₂CH₂]₂CH₂(HL), by H₃AlNMe₃ in diethyl ether affords a monomeric, Lewis base-stabilised amidoalane Me₃NAIH₂L, 1[Al–N_amido, N_amine 1.838(2), 2.058(2)Å], whereas treating AIH₃ generated in situ with the same amine in diethyl ether yields a remarkably stable secondary amine adduct of alane H₃Al(HL), 2(decomp. > 115 °C), also as a monomer in the solid [Al–N_HL 2.04(1)Å].