Process for the preparation of 2,3,5,6-tetrafluorobenzoic acid, and the new compounds 2,3,5,6-tetrachloro-4-trifluoromethyl-benzoyl chloride and 2,3,5,6-tetrafluoro-4-trifluoromethyl-benzoyl fluoride
US4755621A · kind A · utility
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20Claims
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Key dates
| Filing date | Jun 11, 1987 |
| Grant date | Jul 5, 1988 |
| Priority date | — |
| Expiry date | Jun 11, 2007 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/60
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
2,3,5,6-Tetrafluorobenzoic acid is prepared from 4-trifluoromethyl-benzoyl fluoride by chlorination, fluorination, hydrolysis, decarboxylation and saponification. The new compounds 2,3,5,6-tetrachloro-4-trifluoromethyl-benzoyl chloride and 2,3,5,6-tetrafluoro-4-trifluoromethyl-benzoyl fluoride are produced during this as intermediates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.