Process for the preparation of 2,3,4,5-tetrafluorobenzoic acid

Details Process for the preparation of 2,3,4,5-tetrafluorobenzoic acid Process for the preparation of 2,3,4,5-tetrafluorobenzoic acid

1992-04-23

1993-01-12

Killos, Paul J.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 6304

Patent

active

051792303

ABSTRACT:
A process for the preparation of 2,3,4,5,-tetrafluorobenzoic acid of the formula (1) ##STR1## by heating N'-substituted N-aminotetrafluorophthalimides of the formula (2) ##STR2## in which X is the radical ##STR3## where R.sub.1, R.sub.2 are a hydrogen atom, an alkyl-(C.sub.1 -C.sub.10)- group, aryl group, alkyl-(C.sub.1 -C.sub.6)-Co- group or aryl-CO- group, it being possible for the aryl or aryl-CO- group in the case of R.sub.1 and R.sub.2 to be substituted on the aromatic ring by fluorine and/or chlorine atoms and/or alkyl-(C.sub.1 -C.sub.4)-groups, or R.sub.1 and R.sub.2 together are a phthaloyl radical which can be substituted on the aromatic ring by 4 chlorine atoms or 4 fluorine atoms, or where X is the radical ##STR4## which can be substituted on the aromatic ring by fluorine and/or chlorine atoms and/or alkyl-(C.sub.1 -C.sub.4)- groups, in an aqueous medium at pH values of approximately -1 to approximately +1 at temperatures of approximately 160 to approximately 220.degree. C.

REFERENCES:
patent: 3246009 (1966-04-01), Loev. B
Buxton, D. et al. Aust. J. Chem. 39(12) 2013-26 1986.
Ishikawa, N. et al. Nippon Kagaku Kaishi (1) 200-2 1976.
Gerasimova, T. N. et al. Izv. Sib Otd. Akad. Nauk SSSR, Ser. Khim Nauk (6) 54-60 1975.

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