Process for the preparation of cis 5-fluoro-2-methyl-1[p-(methylthio)benzyliden]-inden-3-acetic acid
US6355836B1 · kind B1 · utility
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Key dates
| Filing date | Oct 3, 2000 |
| Grant date | Mar 12, 2002 |
| Priority date | — |
| Expiry date | Oct 3, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C319/20
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
An isomerization process of trans-5-fluoro-2-methyl-1-[p-(methylthio)benzyliden]inden-3-acetic acid for the treatment of sodium salt in methanol and in the presence of a base at 70±2° C. is described.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.