Fluorophthalamic acids and method of preparation
US4374267A · kind A · utility
7Cited by
3References
6Claims
0Family size
Assignee
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Key dates
| Filing date | Dec 29, 1980 |
| Grant date | Feb 15, 1983 |
| Priority date | — |
| Expiry date | Dec 29, 2000 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C235/84
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Fluorophthalamic acids characterized by the formula ##STR1## wherein n is 1 or 2, are prepared by the steps of PA1 (A) reacting a chlorophthalic anhydride of the formula ##STR2## where n is as defined previously, with potassium fluoride or cesium fluoride to form a fluorophthalic anhydride of the formula ##STR3## where n is as previously defined, and (B) reacting the fluorophthalic anhydride with ammonia to form an ammonium salt of a fluorophthalamic acid, and PA1 (C) acidifying the ammonium salt to form a fluorophthalamic acid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.