1: 22 percent / CH2Cl2 / 1 h / -78 °C / Irradiation 2: 45 percent / 1 h / Ambient temperature; Irradiation 3: potassium carbonate / ethane-1,2-diol / 4 h / 120 °C 4: 1.) N-bromosuccinimide (NBS), AIBN, 2.) NaI / 1.) carbon tetrachloride, 12 h, reflux, 2.) acetone, 2 h, reflux View Scheme

in dichloromethane T=-78°C; 1 h; Irradiation;

1: 22 percent / CH2Cl2 / 1 h / -78 °C / Irradiation 2: 45 percent / 1 h / Ambient temperature; Irradiation View Scheme

1: 22 percent / CH2Cl2 / 1 h / -78 °C / Irradiation 2: 25 percent / 1 h / Ambient temperature; Irradiation View Scheme

in dichloromethane T=-78°C; 1 h; Irradiation;

1: 22 percent / CH2Cl2 / 1 h / -78 °C / Irradiation 2: 45 percent / 1 h / Ambient temperature; Irradiation 3: potassium carbonate / ethane-1,2-diol / 4 h / 120 °C View Scheme