Process for modifying the rac/meso ratio in a metallocene compound
US5892077A · kind A · utility
2Cited by
5References
20Claims
0Family size
Assignee
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Key dates
| Filing date | Jul 16, 1997 |
| Grant date | Apr 6, 1999 |
| Priority date | — |
| Expiry date | Jul 16, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S526/943
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.