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US 5,495,035 AGranted
Synthesis of ANSA-metallocene catalysts
AssigneeUniversity of Iowa Research Foundation
InventorsRichard F. Jordan, Stephan Rodewald, Gary M. Diamond
Life of this patent
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Abstract
A process of preparing in high yield ansa-metallocene complexes and rac-ansa-metallocene complexes by reacting an ansa-bis-cyclopentadiene compound with a metal amide complex.
Claims20
A process of synthesizing in high yield ansa-metallocene complexes of the formula:
- ##STR6## wherein Cp independently and in each occurrence is cyclopentadienyl, indenyl, or fluorenyl, or a related group that can .pi.-bond to the metal, or a hydrocarbyl, alkyl, aryl, silyl, halo, halohydrocarbyl, hydrocarbylmetalloid, or halohydrocarbylmetalloid substituted derivative of said cyclopentadienyl, indenyl, fluorenyl or related group, X is a bridging group which links the Cp groups, M is a metal selected from the group consisting of Group 3, 4, and 5 metals, R and R' are the same or different and are each hydrogen or hydrocarbyl radicals of from C.sub.1 to C.sub.20, or silyl radicals, and n is from 3 to 5, said process comprising:
- reacting an ansa-bis Cp compound of the formula HCp--X--CpH where Cp and X are as above defined with a metal amide complex to provide a high yield of ansa-metallocene complex.
A process of synthesizing in high yield ansa-metallocene complexes of the formula:
- ##STR7## wherein Cp independently and in each occurrence is cyclopentadienyl, indenyl, or fluorenyl, or a related group that can .pi.-bond to the metal, or a hydrocarbyl, alkyl, aryl, silyl, halo, halohydrocarbyl, hydrocarbylmetalloid, or halohydrocarbylmetalloid substituted derivative of said cyclopentadienyl indenyl, fluorenyl or related group, X is a bridging group which links the Cp groups, M is a metal selected from the group consisting of Group 3, 4, and 5 metals, R and R' are the same or different and are each hydrogen or hydrocarbyl radicals of from C.sub.1 to C.sub.20, or silyl radicals, and n is from 3 to 5, said process comprising:
- reacting an ansa-bis Cp compound of the formula HCp--X--CpH where Cp and X are as above defined with a metal amide complex to provide a high yield of ansa-metallocene complex;
- and thereafter,
- isolating the ansa-metallocene complex from the reaction mixture.
1 more element
A process of synthesizing in high yield rac ansa-metallocene complexes of the formula:
- ##STR8## wherein Cp independently and in each occurrence is a hydrocarbyl, alkyl, aryl, silyl, halo, halohydrocarbyl, hydrocarbylmetalloid, or halohydrocarbylmetalloid substituted cyclopentadienyl, an indenyl, a fluorenyl, or a related group that can .pi.-bond to the metal, or a hydrocarbyl, alkyl, aryl, silyl, halo, halohydrocarbyl, hydrocarbylmetalloid, or halohydrocarbylmetalloid substituted derivative of said indenyl, fluorenyl, or related group, X is a bridging group which links the Cp groups, M is a metal selected from the group consisting of Group 3, 4, and 5 metals, R and R' are the same or different or linked and are each hydrogen or hydrocarbyl radicals of from C.sub.1 to C.sub.20, or silyl radicals, and n is from 3 to 5, said process comprising:
- reacting a hydrocarbyl, alkyl, aryl, silyl, halo, halohydrocarbyl, hydrocarbylmetalloid, or halohydrocarbylmetalloid substituted ansa-bis-cyclopentadiene, or an ansa-bis-indene, or an ansa-bis-fluorene or a related group that can .pi.-bond to the metal, or a hydrocarbyl, alkyl, aryl, silyl, halo, halohydrocarbyl, hydrocarbylmetalloid, or halohydrocarbylmetalloid substituted derivative of said ansa-bis-indene, ansa-bis-fluorene or related group, with a metal amide complex to provide a high yield of rac ansa-metallocene complex.
Dependencies are inferred from the claim text.