Process for the isomerization of metallocene compounds

Details Process for the isomerization of metallocene compounds Process for the isomerization of metallocene compounds

2004-09-07

2008-12-16

Choi, Ling-Siu (Department: 1796)

Catalyst, solid sorbent, or support therefor: product or process

Catalyst or precursor therefor

Organic compound containing

C502S124000, C502S123000, C502S152000, C502S167000, C526S160000, C526S170000, C526S943000, C556S052000, C556S053000

Reexamination Certificate

active

07465688

ABSTRACT:
An isomerization process comprising the step of contacting a slurry or a solution comprising the meso or meso-like form of one or more bridged metallocene compounds of group 4 of the Periodic Table of the Elements having C2or C2-like symmetry with an isomerization catalyst of formula (I) [R4W]+X−(I) wherein: W is a nitrogen or a phosphorus atom; R, equal to or different from each other, are C1-C40hydrocarbon radicals and X−is an halide atom.

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Yoder et al. Organometallics, 1998, 17, 4946-4958.
Luigi Resconi et al., “Selectivity in Propene Polymerization with Metallocene Catalysts,”Chem. Rev., vol. 100(4), p. 1253-1345 (2000).
J. Yoder et al., Racemic-Meso Interconversion foransa-Scandocene andansa-Yttrocene Derivatives. Molecular Structures of rac-{Me2Si[n5-C5H2-2, 4-(CHMe2)2]2}ScCI•LiCI(THF)2, [meso-{Me2Si[n5-C5H2-2,4-(CHMe2)2]2}Y(μ2-CI)]2, andmeso-{Me2Si[n5-C5H2, 4-(CHMe2)2]2}Zr(NMe2)2,Organometallics, vol. 17(23), p. 4946-4958 (1998).

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