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US 12,398,167 B2Granted
Process for producing metallocenes
AssigneeLANXESS Organometallics GmbH
InventorsSilvia Maus, Bianka Hofmann, Thorsten Holtrichter-Roessman
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Abstract
The present invention relates to an improved process for the preparation of metallocenes of the general formula (A) CR2L2MX2 as well as to intermediates useful in the synthesis of said metallocene and the use thereof as a catalyst in a polymerization of an olefin.
Claims13
A process for preparing a metallocene of the general formula (A)
- CR2L2MX2 (A)
- comprising the steps of:
- (a) reacting a symmetric or asymmetric, linear or cyclic ketone of the general formula (B) (C═O)R2 and ligand L in the presence of an alkali metal alkoxide M1OR1 so as to form a compound of the general formula (C) CR2L2in dimethylsulfoxide;
- and
- (b) reacting said compound (C) CR2L2 with metal halide MX4 in the presence of a deprotonation agent, wherein the deprotonation agent is an n-BuLi solution in hexane with a concentration of 80% or more,
- whereas
- R is individually C1-C8 alkyl, cycloalkyl or phenyl,
- R1 is C1-C20 alkyl,
- L is individually unsubstituted indenyl, substituted indenyl, unsubstituted benzoindenyl, substituted benzoindenyl,
- M is zirconium, hafnium, titanium or a lanthanide,
- M1 is an alkali metal, and
- X is halogen.
9 more elements
Dependencies are inferred from the claim text.