Enhanced synthesis of racemic metallocenes
AssigneeAlbemarle Corporation
InventorsJamie R. Strickler, John M. Power
Life of this patent
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Abstract
Chiral metallocenes are prepared by reacting a salt of an asymmetric bis(cyclopentadienyl)-moiety-containing ligand with a chelate diamine adduct of a transition, lanthanide, or actinide metal halide in an organic solvent or diluent so as to produce said chiral metallocene.
Claims23
A process for preparing a chiral metallocene, said process comprising mixing (i) a solution of a salt of an asymmetric bis(cyclopentadienyl)-moiety-containing ligand in whatever chemical form it exists while in said solution, with (ii) an organic liquid medium containing a solution or slurry of a chelate diamine adduct of a transition, lanthanide or actinide metal halide in whatever chemical form it exists while in said solution or slurry, at least 50 weight percent of the solvent or diluent of said solution of (i) being one or more liquid aliphatic or cycloaliphatic polyethers, and at least 50 weight percent of the solvent or diluent of said solution or slurry of (ii) being one or more liquid aliphatic, cycloaliphatic or aromatic hydrocarbons.
A process for preparing a chiral metallocene, said process comprising adding (i) a solution of an alkali metal salt of an asymmetric bis(cyclopentadienyl)-moiety-containing ligand in whatever chemical form it exists while in said solution, to (ii) an solution or slurry of a chelate diamine adduct of a Group 4 metal halide in whatever chemical form the adduct exists while in said solution or slurry, at least 50 weight percent of the solvent of said solution of (i) being one or more liquid aliphatic or cycloaliphatic diethers, and at least 50 weight percent of the liquid solvent or diluent of said solution or slurry of (ii) being one or more liquid aliphatic, cycloaliphatic or aromatic hydrocarbons.
Dependencies are inferred from the claim text.