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–Namido, Namine 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–NHL 2.04(1)Å].