Process for modifying the rac/meso ratio in a metallocene...

Details Process for modifying the rac/meso ratio in a metallocene... Process for modifying the rac/meso ratio in a metallocene...

C - Chemistry, Metallurgy

07

F

C07F 17/00 (2006.01)

Patent

CA 2210314

It is possible to modify the rac/meso ratio of a rac/meso mixture in a stereorigid, bridged metallocene compound by subjecting a rac/meso isomeric mixture directly obtained from the synthesis to selective decomposition of the undesired isomer in the presence of compounds having either acidic hydrogen atoms or reactive halogen atoms. This process allows to prepare chiral metallocenes in their pure racemic or meso isomeric form.

Il est possible de modifier le rapport racémique-méso d'un mélange racémique-méso dans un composé ponté de type métallocène en soumettant un mélange isomérique racémique-méso, obtenu directement par synthèse, à la décomposition sélective de l'isomère indésirable en présence de composés possédant soit des atomes d'hydrogène acides ou des atomes d'halogène réactifs. Ce procédé permet la préparation de métallocènes chiraux sous une forme racémique ou méso isomérique pure.

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