3-cyano-2,4,5-trifluoro - benzoyl fluoride

(57) Abstract: The present invention is 3-cyano-2,4,5-trifluoro - benzoyl fluoride, intermediate and 3-cyano-2,4,5-trifluoro for their preparation - benzoyl fluoride a method for manufacturing. This manufacturing method, 5-fluoro-1,3 starting from xylene (VIII), performs two rings chlorination in the presence of a catalyst in ionic conditions, 2,4-dichloro-5-fluoro - 1,3 obtained dimethyl benzene (VII), this was subject to chlorination in the side chain by a free radical conditions, 2,4-dichloro-5-fluoro-3-dichloromethyl-1-trichloromethylbenzene of (VI) obtained, subsequently, which is hydrolyzed via may be isolated 2,4-dichloro-5-fluoro-3-dichloromethyl-benzoic acid (V) optionally, 2,4-dichloro-5-fluoro-3- formyl benzoic acid (IV), by converting the aldehyde group, 2,4-dichloro-5-fluoro -3-N-hydroxyimino to give methyl benzoate (III), in this case, by using the acid chloride at the same time to remove the water, to convert the carboxyl group into chlorocarbonyl group, a nitrile 2,4-dichloro-3-cyano-5-fluoro - base Benzoyl chloride obtained Ride (II), this ultimately consists subjected to fluorine / chlorine exchange.