[CH:1]1([CH:6]([C:14]2[CH:19]=[CH:18][C:17]([CH3:20])=[CH:16][CH:15]=2)[C:7]([O:9][C:10]([CH3:13])([CH3:12])[CH3:11])=[O:8])[CH2:5][CH2:4][CH2:3][CH2:2]1.N(C(C)(C)C#N)=NC(C)(C)C#N.C1C(=O)N([Br:40])C(=O)C1>C(Cl)(Cl)(Cl)Cl>[Br:40][CH2:20][C:17]1[CH:18]=[CH:19][C:14]([CH:6]([CH:1]2[CH2:5][CH2:4][CH2:3][CH2:2]2)[C:7]([O:9][C:10]([CH3:12])([CH3:11])[CH3:13])=[O:8])=[CH:15][CH:16]=127.4 g (0.1 mol) of tert-butyl 2-cyclopentyl-2-(4-methylphenyl)-acetate are dissolved in 200 ml of carbon tetrachloride and the solution is heated to boiling point. After an addition of 0.82 g of azobisisobutyronitrile, 18.7 g (0.105 mol) of n-bromosuccinimide are added in portions, the mixture is subsequently refluxed for 1 hour and cooled to 0° C., and succinimide is filtered off. After concentration of the filtrate, the product precipitates. It is washed with petroleum ether (40/60) and dried. Yield: 20 g (57% of theory)
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