Crystal structures of organometallic compounds of lithium and magnesium containing the bulky ligands C(SiMe3)2(SiMe2X) X=Me, Ph, NMe2, or C5H4N-2

Salih S. Al-Juaid, Anthony G. Avent, Colin Eaborn, Salima M. El-Hamruni, Simon A. Hawkes, Michael S. Hill, Martijn Hopman, Peter B. Hitchcock, J. David Smith

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

The complex [Li(TMEDA){C(SiMe3)2SiMe2NMe2}] (1) (TMEDA=N,N,N′,N′-tetramethylethane-1,2,-diamine) was found to crystallise with an internally coordinated structure like that of [Li(THF)2{C(SiMe3)2SiMe2NMe 2}] (THF=tetrahydrfuran). In contrast, the compound with Ph in place of NMe2 crystallised as a dialkyllithate [Li(TMEDA)2][Li{C(SiMe3)2(SiMe 2Ph)}2] (4). The reaction of 4 with MgBr2 gave the doubly bromide-bridged lithium-magnesium complex [Li(TMEDA)(μ-Br)2Mg{C(SiMe3)2(SiMe 2Ph)}(THF)] (6), and that of [Li(THF){C(SiMe3)2(SiMe2C5H 4N-2)}] gave the singly bridged compound [Li(THF)3(μ-Br)MgBr{C(SiMe3)2(SiMe 2C5H4N-2)] (8). The Grignard reagents [Mg{C(SiMe3)3}I(OEt2)]2 (10) and [Mg{C(SiMe3)2 (SiMe2Ph)}I(OEt2)]2 (11) were obtained from the reactions between (Me3Si)3CI and (Me2Ph)(Me3Si)CI, respectively, with magnesium metal and shown to have halide-bridged structures. The unsymmetrical dialkylmagnesium [MgBu{C(SiMe3)2(SiMe2NMe2)}(THF)] (13), was prepared from a mixture of LiBu, 1 and [MgBr2 (OEt2)2].

Original languageEnglish
Pages (from-to)76-86
Number of pages11
JournalJournal of Organometallic Chemistry
Volume631
Issue number1-2
DOIs
Publication statusPublished - 10 Aug 2001

Keywords

  • Bulky ligands
  • Lithium
  • Magnesium

ASJC Scopus subject areas

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

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