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    • 90. 发明专利
    • PRODUCTION OF HALOGENOBENZOIC ACIDS
    • JPH07233117A
    • 1995-09-05
    • JP2689794
    • 1994-02-24
    • ASAHI GLASS CO LTD
    • SEKI TAKASHISUGIMOTO KOJIKUMAI SEISAKU
    • C07C27/02C07B61/00C07C51/083C07C63/70
    • PURPOSE:To safely produce halogenobenzoic acids in high yield without using hazardous reagents and operations by reacting an easily available halogenophthalic acid anhydride with a hydroxy compound and subjecting the reaction product to decarbonation and hydrolysis. CONSTITUTION:This process for the production of a halogenobenzoic acid of formula V comprises the reaction of a halogenophthalic acid anhydride of formula I (X to X each is a halogen or H and at least one of X to X is F) with a hydroxy compound to obtain a halogenophthalic acid monoester of formula II and formula III (R is a univalent group obtained by removing OH from the hydroxy compound), the decarbonation of the ester and the hydrolysis of the resultant halogenobenzoic acid ester of formula IV. The halogenophthalic acid monoester is preferably a halogenophthalic acid monoalkyl ester, a halogenophthalic acid monofluoroalkyl ester or a halogenophthalic acid monoaryl ester. The reaction is carried out preferably in the presence of a catalyst. The reaction proceeds under mild reaction condition and is advantageous for industrial use.