Preparation and reactions of Cp2HfRCl, Cp2HfRR′ and hafnacyclopent-2-enes

Yasushi Nishihara, Toyohisa Ishida, Shouquan Huo, Tamotsu Takahashi

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7 Citations (Scopus)

Abstract

Reaction of Cp2HfCl2 with R3Al (R = Et, n-Pr, or n-Bu) in hexane selectively produced monoalkylhafnocene complexes, Cp2HfRCl (1), in high yields. Cp2HfMeCl (1a) was prepared by the reaction of oxo-bridged hafnocene complex (Cp2HfCl)2(μ-O) with Me3Al. The treatment of 1 with alkylating reagents such as R′Li or EtMgBr afforded unsymmetrical dialkylhafnocene complexes Cp2HfRR′ (3) in good to excellent yields. The kinetic study of thermolysis of Cp2HfEtR (R = Me, Et, n-Bu, sec-Bu, t-Bu or Ph) suggested that decomposition of Cp2HfEt(sec-Bu) was much faster than the others. Cp2Hf(sec-Bu)2 (2e) can be used as a good precursor of Cp2Hf(II) species. Hafnacyclopent-2-enes (4) were prepared in good yields by the reaction of Cp2HfEt2 (2b) with alkynes.

Original languageEnglish
Pages (from-to)209-216
Number of pages8
JournalJournal of Organometallic Chemistry
Volume547
Issue number2
DOIs
Publication statusPublished - Dec 1 1997

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Keywords

  • Alkylhafnocene chloride
  • Dialkylhafnocene
  • Hafnacyclopent-2-ene
  • Hafnacyclopentadiene

ASJC Scopus subject areas

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

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