[C:1]1([CH3:12])[CH:6]=[CH:5][CH:4]=[C:3]([C:7]([CH:9]2[CH2:11][CH2:10]2)=[O:8])[CH:2]=1.[Br:13]N1C(=O)CCC1=O>C(Cl)(Cl)(Cl)Cl>[CH:9]1([C:7]([C:3]2[CH:2]=[C:1]([CH2:12][Br:13])[CH:6]=[CH:5][CH:4]=2)=[O:8])[CH2:10][CH2:11]1A stirred suspension of cyclopropyl m-tolyl ketone (16 g) and N-bromosuccinimide (17.8 g) in carbon tetrachloride (100 ml) was irradiated and heated under reflux by means of a tungsten lamp for 2 hours and cooled. The solid was filtered off and the filtrate evaporated. The residual oil was distilled under reduced pressure and the fraction distilling at 115°-130°/0.1 mm was collected.
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