Cl.[NH2:2][OH:3].[F:4][C:5]1[CH:6]=[C:7]([CH:17]=[CH:18][CH:19]=1)[C:8]([C:10]1[CH:15]=[CH:14][CH:13]=[C:12]([F:16])[CH:11]=1)=O.[OH-].[Na+].Cl>O.C(O)C>[F:4][C:5]1[CH:6]=[C:7]([CH:17]=[CH:18][CH:19]=1)[C:8](=[N:2][OH:3])[C:10]1[CH:15]=[CH:14][CH:13]=[C:12]([F:16])[CH:11]=13-3′-Difluorobenzophenone oxime may be prepared according to the following procedure: a solution of 1.6 g of hydroxylamine hydrochloride in 8 cm3 of water is poured dropwise into a solution of 5.0 g of 3,3′-difluorobenzophenone in 10 cm3 of ethanol, and then 1.2 g of sodium hydroxide pellets are added in small fractions. The reaction mixture, heated under reflux for 10 minutes, is cooled to 20° C. and then acidified with 7.5 cm3 of 4 N hydrochloric acid. Once triturated, the oily precipitate obtained becomes a white solid which is filtered, washed with water and then dried at 35° C. under reduced pressure (2.7 kPa). 5.17 g of 3,3′-difluorobenzophenone oxime are obtained in the form of a white solid.
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