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 language | English |
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Pages (from-to) | 209-216 |
Number of pages | 8 |
Journal | Journal of Organometallic Chemistry |
Volume | 547 |
Issue number | 2 |
DOIs | |
Publication status | Published - Dec 1 1997 |
Externally published | Yes |
Keywords
- Alkylhafnocene chloride
- Dialkylhafnocene
- Hafnacyclopent-2-ene
- Hafnacyclopentadiene
ASJC Scopus subject areas
- Biochemistry
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry
- Materials Chemistry