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

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

1997-07-16

1999-04-06

Nazario-Gonzalez, Porfirio

Organic compounds -- part of the class 532-570 series

Organic compounds

Heavy metal containing

556 20, 556 43, 556 45, 534 15, 526160, 526943, 502152, 502162, C07F 1700, C07F 700

Patent

active

058920773

ABSTRACT:
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.

REFERENCES:
patent: 4769510 (1988-09-01), Kaminsky
patent: 5302733 (1994-04-01), Diefenbach et al.
patent: 5556997 (1996-09-01), Strickler et al.
patent: 5597935 (1997-01-01), Jordan et al.
patent: 5672668 (1997-09-01), Winter et al.

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