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    • 7. 发明授权
    • Process for the preparation of halogenated benzoic acids
    • 卤代苯甲酸的制备方法
    • US5481032A
    • 1996-01-02
    • US159087
    • 1993-11-29
    • Ralf Pfirmann
    • Ralf Pfirmann
    • C07C37/60C07C51/285C07C63/70C07C63/72C07C65/03C07C65/21C07C65/30C07C67/29C07C69/035C07C201/12C07C205/58C07C227/02C07C229/54C07C231/12C07C233/65C07C235/46C07C237/30C07C253/30C07C255/57C07C315/04C07C317/44C07C229/52
    • C07C51/285C07C37/50C07C41/16Y02P20/582
    • A process for the preparation of halogenated benzoic acids of formula (1): ##STR1## in which R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are hydrogen, fluorine, chlorine or bromine atoms or C.sub.1 -C.sub.6 -alkyl, C.sub.1 -C.sub.6 -alkoxy, nitro, cyano, trifluoromethyl, aidehyde, C.sub.1 -C.sub.4 -alkoxycarbonyl, -SO.sub.2 -C.sub.1 -C.sub.4 -alkyl, -SO.sub.2 -phenyl, -CONH.sub.2, -CON(C.sub.1 -C.sub.4 -alkyl).sub.2, hydroxy, carboxy, -NH.sub.2 or -N(C.sub.1 -C.sub.4 - alkyl).sub.2 groups, at least one of the substituents R.sub.1 -R.sub.5 being one of said halogen atoms, which comprises reacting 1 mol of a benzophenone, asymmetrically substituted on the benzene rings A and B, of general formula (2): ##STR2## in which R.sup.1 -R.sup.10 are as defined above for R.sub.1 -R.sub.5, with about 1 to about 10 mol of an oxidizing agent selected from the group comprising hydrogen peroxide, urea/hydrogen peroxide addition product, an alkali metal peroxide, ammonium, alkali metal or alkaline earth metal peroxodisulfates, pertungstates, perborates or percarbonates, ozone, alkyl- or aryl-percarboxylic acids, alkyl- or aryl-persulfonic acids or persulfuric acid, at temperatures from about -20.degree. to about +100.degree. C.
    • 制备式(1)的卤代苯甲酸的方法:其中R1,R2,R3,R4和R5是氢,氟,氯或溴原子或C1-C6-烷基,C1- C 1 -C 4烷氧基,硝基,氰基,三氟甲基,脱氢,C 1 -C 4烷氧基羰基,-SO 2 -C 1 -C 4烷基,-SO 2 - 苯基,-CONH 2,-CON(C 1 -C 4烷基)2,羟基,羧基, -NH 2或-N(C 1 -C 4 - 烷基)2基团,至少一个取代基R 1 -R 5是所述卤素原子之一,其包括使1摩尔苯苯酮在苯环A和B上不对称取代, 的通式(2):其中R 1 -R 10如上文对R 1 -R 5所定义,其中约1至约10mol氧化剂选自过氧化氢,尿素/过氧化氢 加成产物,碱金属过氧化物,铵,碱金属或碱土金属过氧二硫酸盐,过钨酸盐,过硼酸盐或过碳酸盐,臭氧,烷基或芳基过羧酸,烷基或芳基 - 磺酸或说服 在约-20℃至约+ 100℃的温度下,