Syntheses of some bulky alkylalanes and alkyltrihydroaluminates: Crystal structures of [Li(THF)2AlH3C(SiMe3)2(SiMe 2NMe2)]2, Li(THF)2Al2H5(C(SiMe3) 3)2, (Me3Si)3CAlH2·THF and the pyrazolato derivative

Colin Eaborn, Salima M. El-Hamruni, Michael S. Hill, Peter B. Hitchcock, Martijn Hopman, Armelle Le Gouic, J. David Smith

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Abstract

The alkylaluminate [Li(THF)2AlH3C(SiMe3)2(SiMe 2NMe2)]2 (3), obtained by the reaction between [LiC(SiMe3)2(SiMe2NMe2)·2THF] and LiAlH4, has a cyclic structure like those of the compounds [Li(THF)2AlH3R]2 (R=C(SiMe3)3 (1), or C(SiMe2Ph)3 (2)). The Al and Li atoms are linked by hydride bridges and the NMe2 groups are not coordinated to metal centres. The compound 1 reacts (i) with one equivalent of SiMe3Cl to give the cyclic dialuminate Li(THF)2(μ-H)AlHR(μ-H)AlHRH (4) (characterised by an X-ray study); (ii) with two equivalents of SiMe3Cl to give the alane-THF complex (Me3Si)3CAlH2·THF (5); and (iii) with an excess of pyrazole to give [LiAlH(C3H3N2)2C(SiMe 3)3]2 (7), in which Al and Li atoms are linked by both hydride and pyrazolato bridges. The compound (Me2PhSi)3CAlH2·THF (6) has been obtained by the reaction of 2 with two equivalents of SiMe3Cl.

Original languageEnglish
Pages (from-to)3-9
Number of pages7
JournalJournal of Organometallic Chemistry
Volume597
Issue number1-2
DOIs
Publication statusPublished - 15 Mar 2000

Keywords

  • Alkylalanes
  • Aluminium
  • Lithium
  • Pyrazolato

ASJC Scopus subject areas

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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