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0 °C

27.4 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)

1. temperaturethe solution is heated
2. additionare added in portions
3. temperaturethe mixture is subsequently refluxed for 1 hour
4. filtrationsuccinimide is filtered off
5. customAfter concentration of the filtrate, the product precipitates
6. washIt is washed with petroleum ether (40/60)
7. customdried