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

C - Chemistry, Metallurgy

07

C

C07C 63/70 (2006.01) C07C 51/00 (2006.01) C07C 51/06 (2006.01)

Patent

CA 2067075

HOE 91/F 119 Abstract of the disclosure: Process for the preparation of 2,3,4,5-tetrafluorobenzoic acid A process for the preparation of 2,3,4,5,-tetrafluoro- benzoic acid of the formula (1) (1), Image by heating N'substituted N-aminotetrafluorophthalLmides of the formula (2) Image (2), in which X, is the radical Image , where Rl, R2 are a hydrogen atom, an alkyl-(Cl-C1O)- group, aryl group, alkyl-(C1 -C6) CO- group or aryl-CO- group, it being possible for the aryl or aryl-CO- group in the case of R1 and Rz to be substituted on the aromatic ring by fluorine and/or chlorine atoms and/or alkyl-(C1-C4)- groups, or R1 and R2 together are a phthaloyl radlcal which can be substituted on the aromatic ring by 4 chlorine atoms or 4 fluorine atoms, ox where X is the radical Image which can be substituted on the aromatic ring by fluorine and/or chlorine atoms and/or alkyl-(C1-C4)- groups, ln an aqueous medium at pH values of approximately -1 to approximately +1 at temperatures of approxi.mately 160 to approximately 220 °C.

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