Preparation of trifluoromethylbenzoic acid from hexafluoroxylene
US4929753A · kind A · utility
2Cited by
1References
9Claims
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Key dates
| Filing date | Apr 19, 1988 |
| Grant date | May 29, 1990 |
| Priority date | — |
| Expiry date | Apr 19, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C51/093
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Trifluoromethylbenzoic acid is obtained at high yield from .alpha.,.alpha.,.alpha.,.alpha.',.alpha.',.alpha.'-hexafluoroxylene, which is a relatively inexpensive compound, by reacting this compound with a strong acid in sulfuric acid which is at least partly fuming sulfuric acid. It is best to use fuming sulfuric acid as the strong acid. The reaction temperature ranges from room temperature to 150.degree. C., though temperatures below 100.degree. C. are preferable. By this reaction only one trifluoromethyl group of hexafluoroxylene is hydrolyzed so far as the strong acid is not in large excess.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.