Difluorophthalic compounds and their preparation

Details Difluorophthalic compounds and their preparation Difluorophthalic compounds and their preparation

1994-06-20

1995-04-11

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

562480, 549246, C02C 5100

Patent

active

054059950

ABSTRACT:
Disclosed are novel compounds having the formula ##STR1## where A is O or NR, each R' independently selected from hydrogen, R, or M, R is alkyl, aryl, alkaryl, or aralkyl from C.sub.1 to C.sub.12, and M is a cation. Also disclosed is a method of making those compounds and a method of making a mixture of 3,5-difluorobenzoic acid and 1,3-difluorobenzene by reacting 3,5-dichlorophthalic anhydride with a fluorinating agent to produce 3,5-difluorophthalic anhydride, reacting the 3,5-difluorophthalic anhydride with water to produce 3,5-difluorophthalic acid, and decarboxylating the 3,5-difluorophthalic acid.

REFERENCES:
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patent: 4937377 (1990-06-01), Fertel et al.
patent: 5200556 (1993-04-01), Papenfuhs et al.
patent: 5294738 (1994-03-01), Stults et al.
patent: 5322954 (1994-06-01), Seper et al.
Okazaki K et al Synth Commun (1987) 17(9) 1021-7.

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