| 摘要 |
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. <CHEM> |
