| 摘要 |
Titanium and zirconium complexes comprising one or more, cyclic, delocalized .pi.-bonded ligand groups wherein the metal of said complexes is in the +2 formal oxidation state are prepared in high yield and purity by reaction of the corresponding titanium or zirconium halides in the +3 or +4 oxidation state with a di(C1-20alkyl) magnesium reagent. The complexes are used as catalyst components for olefin polymerization catalysts.
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