1: 0.85 g / t-butyl hypochlorite, bromine / CH2Cl2 / 5 h 2: 10 percent Spectr. / silver tetrafluoroborate 3: 56 percent Spectr. / potassium t-butoxide, bromine / benzene / 2 h / Ambient temperature; further reagent View Scheme

1: 0.85 g / t-butyl hypochlorite, bromine / CH2Cl2 / 5 h 2: 10 percent Spectr. / silver tetrafluoroborate 3: 12 percent Spectr. / potassium t-butoxide, bromine / benzene / 2 h / Ambient temperature; further reagent View Scheme