1: 70 percent / 1,3-dibromo-5,5-dimethylhydantoin, benzoyl peroxide / CCl4 / 0.33 h / Heating; Irradiation 2: K2CO3 / dimethylformamide / 4 h / 75 °C 3: NaOCH3 / methanol / 1.5 h / Heating View Scheme

1: 70 percent / 1,3-dibromo-5,5-dimethylhydantoin, benzoyl peroxide / CCl4 / 0.33 h / Heating; Irradiation 2: NaH / toluene / 2 h / 75 °C 3: 0.75 g / NaOCH3 / methanol / 0.75 h / Heating View Scheme