[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[CH:9]=[C:10]([CH3:15])[C:11]([CH3:14])([CH3:13])[CH3:12].[Br:16]N1C(=O)CCC1=O.CC(N=NC(C#N)(C)C)(C#N)C>ClC(Cl)C(Cl)Cl>[Br:16][CH2:15][C:10]([C:11]([CH3:14])([CH3:13])[CH3:12])=[CH:9][C:3]1[CH:4]=[CH:5][C:6]([Cl:8])=[CH:7][C:2]=1[Cl:1]A mixture of 24.3 g (0.1 mol) of 1-(2,4-dichlorophenyl)-2,3,3-trimethylbut-1-ene, 17.8 g (0.1 mol) of N-bromosuccinimide and a spatula-tip of azodiisobutyrodinitrile in 100 ml of absolute 1,1,2,2-tetrachloroethane is boiled under reflux overnight. For working up, the mixture is concentrated in vacuo, the residue is taken up in carbon tetrachloride, the mixture is filtered and the filtrate is distilled. 20 g (62.1% of theory) of 2-bromomethyl-1-(2,4-dichlorophenyl)-3,3-dimethylbut-1-ene of boiling point 108° C. at 0.13 mbar are obtained. ##STR100##
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