申请人:ABBOTT LABORATORIES
公开号:EP0781757A1
公开(公告)日:1997-07-02
A process for the preparation of 2-chloro-4,5-difluorobenzoic acid and 2,4,5-trifluorobenzoic acid as well as acid fluorides thereof, comprising reacting a benzoyl chloride having the formula (V), wherein X' is chloro or fluoro, one of Y and Z is chloro and the other of Y and Z is nitro, with an appropriate fluoride, subject to the proviso that the benzoyl chloride, wherein Z is chloro, is used for the preparation of 2-chloro-4,5-difluorobenzoic acid and the acid fluoride thereof.
一种制备 2-氯-4,5-二氟苯甲酸和 2,4,5-三氟苯甲酸及其酸性氟化物的工艺,包括使具有式 (V)的苯甲酰氯(其中 X'为氯或氟、Y和Z中的一个为氯,Y和Z中的另一个为硝基,与适当的氟化物反应,但条件是,其中Z为氯的苯甲酰氯用于制备2-氯-4,5-二氟苯甲酸及其酸性氟化物。