[Cl:1][C:2]1[CH:3]=[C:4]([N:9]2[C:13](=[O:14])[C:12]([CH2:16][CH:17]=[CH2:18])(O)[C:11]([C:19]([F:22])([F:21])[F:20])=[N:10]2)[CH:5]=[CH:6][C:7]=1[Br:8].C(N(SN(CC)CC)CC)C.[F-:34].[F-].[F-].C(=O)(O)[O-].[Na+]>C(Cl)Cl>[Cl:1][C:2]1[CH:3]=[C:4]([N:9]2[C:13](=[O:14])[C:12]([F:34])([CH2:16][CH:17]=[CH2:18])[C:11]([C:19]([F:22])([F:21])[F:20])=[N:10]2)[CH:5]=[CH:6][C:7]=1[Br:8]4 g of 1-(3-chloro-4-bromophenyl)-3-trifluoromethyl-4-allyl-4-hydroxy-5-pyrazolone in 200 ml of methylene chloride were cooled to -10° C. and 2.7 ml of trifluoride diethylaminosulfide were added all at once. The mixture was stirred for one hour at -10° C./-3° C. 120 ml of a saturated solution of sodium bicarbonate were added and stirring was carried out for 10 minutes, followed by decanting, washing with water, drying and bringing to dryness. The residue was chromatographed on silica and eluted with a hexane-methylene chloride mixture (8-2) to obtain 1.1 g of 1-(3-chloro-4-bromophenyl)-3-trifluoromethyl-4-fluoro-4-allyl-5-pyrazolone.
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