[Cl:1][C:2]1[CH:16]=[C:15]([Cl:17])[CH:14]=[CH:13][C:3]=1[O:4][CH2:5][C:6](=[O:12])[C:7]([CH3:11])([CH3:10])[CH2:8][F:9].[Br:18]Br.O>C(Cl)(Cl)Cl>[Br:18][CH:5]([O:4][C:3]1[CH:13]=[CH:14][C:15]([Cl:17])=[CH:16][C:2]=1[Cl:1])[C:6](=[O:12])[C:7]([CH3:11])([CH3:10])[CH2:8][F:9]199.5 g (0.71 mol) of 1-(2,4-dichlorophenoxy)-3,3-dimethyl-4-fluoro-2-butanone were dissolved in 500 ml of chloroform and 114 g (0.71 mol) of bromine were added dropwise at 20° to 30° C., while stirring and cooling. The mixture was subsequently stirred at 20° C. for 2 hours, 200 ml of water were carefully added to the chloroform phase was washed several times with ice-water and dried over sodium sulphate. After distilling off the solvent in vacuo, 205.2 g (78% of theory) of 1-bromo-1-(2,4-dichlorophenoxy)-3,3-dimethyl-4-fluoro-2-butanone were obtained as an oil which was further reacted directly. ##STR83##
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