[Cl:1][C:2]([Cl:11])=[CH:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[CH3:10].[Br:12]N1C(=O)CCC1=O>ClC(Cl)(Cl)C>[Cl:1][C:2]([Cl:11])=[CH:3][C:4]1[CH:9]=[CH:8][CH:7]=[CH:6][C:5]=1[CH2:10][Br:12]211 g (1.13 moles) of 2-(2,2-dichlorovinyl)-toluene, 251 g (1.41 moles) of N-bromosuccinimide and 2 g of azoisobutyronitrile in 1300 ml of dry 1,1,1-trichloroethane are refluxed, an additional 1 g of azoisobutyronitrile is added to the reaction mixture after one hour, and heating is continued for a further hour.
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