Premium
Aluminium Hydrazides: Dimeric Bis( tert ‐butyl)aluminium Hydrazides withSix‐Membered Al 2 N 4 and Five‐Membered Al 2 N 3 Heterocycles
Author(s) -
Uhl Werner,
Molter Jens,
Koch Rainer
Publication year - 2000
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/1099-0682(200010)2000:10<2255::aid-ejic2255>3.0.co;2-k
Subject(s) - chemistry , hydrazide , dimer , hydrogen bond , medicinal chemistry , ligand (biochemistry) , adduct , crystal structure , phenylhydrazine , hydrazone , polymer chemistry , crystallography , organic chemistry , molecule , biochemistry , receptor
Treatment of the hydrazine adduct (Me 3 C) 2 AlCl·NH 2 NHSiMe 3 ( 2 ) with n ‐butyllithium afforded the colorless dialkylaluminium hydrazide (Me 3 C) 2 AlN(SiMe 3 )NH 2 ( 3 ) by the release of butane and the precipitation of LiCl. Hydrazide 3 gave a dimer in solution and in the solid state. As shown by a crystal structure determination, a six‐membered Al 2 N 4 heterocycle with two intact endocyclic N−N bonds was formed by a head‐to‐tail dimerization. Upon sublimation of 3 in vacuum, a rearrangement was observed which gave an isomeric compound 4 after the migration of a hydrogen atom of a hydrazido ligand. The molecular core of 4 comprises a five‐membered Al 2 N 3 heterocycle, in which the Al atoms are bridged by one hydrazido ligand similar to 3 . The second ligand, however, has only one nitrogen atom in a bridging position with an exocyclic N−N bond. A similar compound ( 5 ) was obtained by the reaction of bis( tert ‐butyl)aluminium chloride with phenylhydrazine and n ‐butyllithium.