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Synthesis, characterisation and a theoretical investigation of the formation of lithium dialkylaluminium amides

Lookup NU author(s): Professor William Clegg, Dr Stephen Liddle

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Abstract

Reaction of the pre-formed crystalline amides [(PhCH2)2NLi] and [Me2AlN(CH2Ph)2] in the presence of pyridine results in the formation of the mixed metal complex [Me2Al{(PhCH2)2N}2Li·pyr] 1. Ab initio molecular orbital calculations indicate formation of the bimetallic product is energetically favourable. Using single crystal X-ray analysis for 1 and the pyridine solvate [{(PhCH2)2NLi·pyr}2] 7, in combination with theoretical calculations, the possible driving forces for the reaction are discussed. A major contributing factor in the stabilisation of the bimetallic compound was found to be a reduction in steric crowding in the mixed metal base compared to the homometallic dialkylaluminium amide. In addition, complex 1 shows significant benzyl to lithium interactions which contribute to the overall bonding. Such interactions are unusual in that donor solvent is present as competing complexant. © 1998 Elsevier Science S.A.

Publication metadata

Author(s): Clegg W, Liddle ST, Henderson KW, Keenan FE, Kennedy AR, McKeown AE, Mulvey RE

Publication type: Article

Publication status: Published

Journal: Journal of Organometallic Chemistry

Year: 1999

Volume: 572

Issue: 2

Pages: 283-289

Print publication date: 15/01/1999

ISSN (print): 0022-328X

ISSN (electronic): 1872-8561

Publisher: Elsevier

URL: http://dx.doi.org/10.1016/S0022-328X(98)00954-1

DOI: 10.1016/S0022-328X(98)00954-1

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