Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1995-02-09
1996-01-30
Killos, Paul J.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C07C 6500
Patent
active
054881528
ABSTRACT:
The present invention relates to a process for the preparation of 4-alkoxy-3,5,6-trifluorophthalic acids of the formula ##STR1## 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 ##STR2## 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, decarboxylating 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.degree. to 180.degree. C., and isolating the 3-alkoxy-2,4,5-trifluorobenzoic acid formed.
REFERENCES:
patent: 5380926 (1995-01-01), Fertel et al.
Chem. Abst. 73:109544 1970.
Papenfuhs Theodor
Pfirmann Ralf
Hoechst Aktiengesellschaft
Killos Paul J.
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