ω-Phenylalkyl-substituted zirconocene dichloride complexes as catalyst precursors for homogeneous ethylene polymerization

The reaction of ω-phenyl-1-bromoalkanes with cyclopentadienyl sodium, indenyl lithium or fluorenyl lithium forms ω-phenylalkyl-substituted ligand precursors in high yields. The corresponding anions react with zirconium tetrachloride to give ω-phenylalkyl-substituted zirconocene dichloride complexes....

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Bibliographic Details
Published in:Journal of organometallic chemistry 2000-04, Vol.599 (2), p.275-287
Main Authors: Licht, Erik H, Alt, Helmut G, Karim, M.Manzurul
Format: Article
Language:English
Subjects:
Catalysis
Ethylene polymerization
Metallocene complexes
Zirconium
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Summary:The reaction of ω-phenyl-1-bromoalkanes with cyclopentadienyl sodium, indenyl lithium or fluorenyl lithium forms ω-phenylalkyl-substituted ligand precursors in high yields. The corresponding anions react with zirconium tetrachloride to give ω-phenylalkyl-substituted zirconocene dichloride complexes. After activation with methylaluminoxane, these complexes are highly active catalysts for homogeneous ethylene polymerization. The nature of the ω-phenyl substituents determines the polymerization activities of the catalysts to a large extent. The polymerization results of 28 new complexes are compared.
ISSN:0022-328X
1872-8561
DOI:10.1016/S0022-328X(00)00009-7