Process for the preparation of tetrafluorophthalic acid and/or t

Details Process for the preparation of tetrafluorophthalic acid and/or t Process for the preparation of tetrafluorophthalic acid and/or t

1993-07-12

1995-01-24

Lee, Mary C.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

549247, 549248, 562483, 562494, 203 15, 203 67, 203 68, 203 69, 203 70, 203 70, C07D30783

Patent

active

053844130

ABSTRACT:
The present invention relates to a process for the preparation of tetrafluorophthalic acid and/or tetrafluorophthalic anhydride by reacting a compound of the formula ##STR1## in which X is a radical ##STR2## which is optionally mono- or polysubstituted on the aromatic nucleus by fluorine and/or chlorine and/or alkyl groups having 1 to 4 carbon atoms, or is a radical ##STR3## in which R.sub.1, R.sub.2 and R.sub.3 are as defined, with water, and subsequently removing the water still present by azeotropic distillation or extracting the tetrafluorophthalic acid and/or its anhydride with a water-insoluble solvent or solvent mixture.

REFERENCES:
patent: 4769493 (1988-09-01), Ito et al.
patent: 5086188 (1992-02-01), Fertel et al.
patent: 5179230 (1993-01-01), Papenfuhs

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