Patent ID: 7465688

Claim:
An isomerization process comprising: contacting a slurry or a solution comprising a meso or meso-like form of at least one bridged metallocene compound of group 4 of the Periodic Table of the Elements having C 2 or C 2 -like symmetry with an isomerization catalyst of formula (I): [R 4 W] + X − (I) wherein W is nitrogen or phosphorus; R, equal to or different from each other, are C 1 -C 40 hydrocarbon radicals optionally containing one or more heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; two R can optionally join to form a saturated or unsaturated C 5 -C 6 membered cycle containing W or two R can optionally join to form a radical of formula (II): wherein R 1 , equal to or different from each other, are C 1 -C 20 hydrocarbon radicals optionally containing one or more heteroatoms belonging to groups 13-17 of the Periodic Table of the Elements; P is phosphorous bonded with a double bond to W; and X − is a halide.