Asymmetric ethylene-bridged metallocenes useful as catalysts in

Details Asymmetric ethylene-bridged metallocenes useful as catalysts in Asymmetric ethylene-bridged metallocenes useful as catalysts in

1998-06-01

2000-08-08

Nazario-Gonzalez, Porfirio

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

502103, 502117, 526160, 526943, C07F 1700, C07F 700

Patent

active

061004162

ABSTRACT:
Novel asymmetric ethylene-bridged metallocenes useful as catalysts in the polymerization of olefins and process for preparing said metallocenes.
The novel metallocenes are represented by the general formula: ##STR1## wherein M represents a transition metal selected from titanium, zirconium and hafnium and X and X' represent a halogen atom. Preferably, the transition metal is Zr and the halogen atoms are both chlorine.
Process for producing the novel metallocenes of general formula (I) comprising the steps of:

REFERENCES:
patent: 5391789 (1995-02-01), Rohrmann
"Unisymmetric ansa-Zirconocene Complexes with Chiral Ethylene Bridges: Influence of Bridge Conformation and Monomer Concentration on the Stereoselectivity of the Propene Polymerization Reaction" by B. Rieger et al. Organometallics 1994, 13, 647-653.

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