Method of making 3-hydroxy-2,4,5-trifluorobenzoic acid

Details Method of making 3-hydroxy-2,4,5-trifluorobenzoic acid Method of making 3-hydroxy-2,4,5-trifluorobenzoic acid

1982-11-16

1993-08-03

Killos, Paul J.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acids and salts thereof

564177, 564179, 562474, C07C22900

Patent

active

052330826

ABSTRACT:
Disclosed is a method of making 3-hydroxy-2,4,5-trifluorobenzoic acid. A aqueous solution is prepared of an alkali metal base and a tetrafluorophthalimide. The solution is heated to produce a mixture of a salt of a 4-hydroxy-3,5,6-trifluorophthalamic acid and a salt of a 3-hydroxy-2,4,5-trifluorobenzamide. The solution is neutralized with acid to form a precipitate of the 4-hydroxy-3,5,6-trifluorophthalamic acid and the 3-hydroxy-2,4,5-trifluorobenzamide. The precipitate is reacted with a mineral acid to produce 3-hydroxy-2,4,5-trifluorobenzoic acid.

REFERENCES:
patent: 2923735 (1960-02-01), Erlenmeyer
patent: 3459794 (1969-08-01), Tamborski
patent: 4160015 (1979-07-01), Wiegert
patent: 4831190 (1989-05-01), Atarca et al.
patent: 4831190 (1989-05-01), Ataka et al.

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