Process for the preparation of 3,4,6-trifluorophthalic acid and

Details Process for the preparation of 3,4,6-trifluorophthalic acid and Process for the preparation of 3,4,6-trifluorophthalic acid and

1992-05-21

1993-04-06

Tsang, Cecilia

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

Organic compounds

Carboxylic acids and salts thereof

549246, 562483, C07D30789, C07C 5106

Patent

active

052005569

ABSTRACT:
Process for the preparation of 3,4,6-tetrafluorophthalic acid of the formula (1) ##STR1## or the anhydride thereof in good yields and in an advantageous manner, by dehalogenating tetrafluorophthalic anhydride of the formula (2) ##STR2## or tetrafluorophthalic acid in aqueous-alkaline medium using zinc at temperatures of approximately 20.degree. C. to approximately 160.degree. C. and, if appropriate, converting the resulting 3,4,6-trifluorophthalic acid into the anhydride in a known manner by dehydrating it.

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