C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 63/68 (2006.01) C07C 51/00 (2006.01) C07C 51/06 (2006.01) C07C 51/38 (2006.01) C07C 51/54 (2006.01) C07D 307/89 (2006.01)
Patent
CA 2100198
HOE 92/F 209 Abstract of the disclosure: Process for the preparation of tetrafluorophthalic acid and/or tetrafluorophthalic anhydride The present invention relates to a process for the preparation of tetrafluorophthalic acid and/or tetra- fluorophthalic anhydride by reacting a compound of the formula Image in which X is a radical Image 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 Image in which R1 and R2 are identical or different and are a hydrogen atom, an alkyl group having 1 to 10 carbon atoms, an alkyl-CO- group having 1 to 6 carbon atoms in the alkyl radical or an aryl group or aryl-CO- group which is optionally mono- or polysubstituted on the aromatic nucleus by fluorine andtor chlorine and/or alkyl groups having 1 to 4 carbon atoms, or R1 and R2 together form a radical of the formula Image in which R3 is a hydrogen atom, a chlorine atom or a fluorine atom, 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.
Papenfuhs Theodor
Pfirmann Ralf
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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