Synthesis, characterisation and reactivity of the first heptamethylindenyl-molybdenum complexes: Crystal structures of [Mo(CO)(η2≡CMe) 25-C9Me7)]BF4 and [Mo(CO) 23-C3H5)(η5-C9Me7)]

Michael Green, Thomas D. McGrath, Rhodri Ll Thomas, Alan P. Walker

Research output: Contribution to journalArticle

Abstract

The synthesis and characterisation of the first (?5-heptamethylindenyl)molybdenum complexes are reported. Reaction of Li[C9Me7] with Mo(CO)6 in refluxing THF readily forms Li[Mo(CO)3(?5-C9Me7)], which is shown to be a useful precursor in the formation of (carbonyl)(?5-heptamethylindenyl)molybdenum complexes. The compounds [MoI(CO)3(?5-C9Me7)] 3, [Mo(Me)(CO)3(?5-C9Me7)] 4 and [Mo(CO)2(?3-C3H5)(?5-C9Me7)] 5 have been prepared from this intermediate and characterised. Treatment of 3 with AgBF4 and MeC=CMe affords [Mo(CO)(MeC=CMe)2(?5-C9Me7)]BF4 6a; for this and the indenyl analogue, a new route to carbonyl-bis(alkyne)-molybdenum derivatives is demonstrated. Reaction of 3 with T1PF6 in MeCN forms the complex [Mo(MeCN)2(CO)2(?5-C9Me7)]PF6 7. Protonation of 5 in the presence of MeC=CMe, or reaction of 7 with the same acetylene, also yields 6 with appropriate counter anions. Single crystal X-ray diffraction studies of compounds 5 and 6a are reported.

Original languageEnglish
Pages (from-to)61-70
Number of pages10
JournalJournal of Organometallic Chemistry
Volume532
Issue number1-2
DOIs
Publication statusPublished - 1 Apr 1997

Keywords

  • Alkyne
  • Carbonyl
  • Crystal structure
  • Heptamethylindenyl
  • Indenyl
  • Molybdenum
  • Permethylindenyl

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