C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 65/21 (2006.01) C07C 51/367 (2006.01) C07C 51/38 (2006.01) C07C 67/31 (2006.01)
Patent
CA 2142255
The present invention relates to a process for the preparation of 4-alkoxy-3,5,6-trifluorophthalic acids of the formula Image (1), in which R is an alkyl radical having 1 to 5 carbon atoms which may be monofluorinated or polyfluorinated, a cycloalkyl radical having 3 to 5 carbon atoms in the ring which may be monofluorinated or polyfluorinated, or an araliphatic radical which may be monofluorinated or polyfluorinated, or, if desired, of 3-alkoxy-2,4,5- trifluorobenzoic acids of the formula Image (2), in which R is as defined above, which involves reacting tetrafluorophthalic acid or tetrafluorophthalic anhydride with an alcohol of the formula ROH in which R is as defined above and with a water-soluble base in water at elevated temperature, isolating the 4-alkoxy-3,5,6- trifluorophthalic acid formed and, if desired, decarboxy- lating the 4-alkoxy-3,5,6-trifluorophthalic acid in the presence of a basic solvent and, if desired, of an inert solvent at from 70 to 180°C, and isolating the 3-alkoxy- 2,4,5-trifluorobenzoic acid formed.
Papenfuhs Theodor
Pfirmann Ralf
Clariant Gmbh
Fetherstonhaugh & Co.
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