1: cobalt meso-tetraphenylporphyrin / CH2Cl2 / 1 h / Ambient temperature; other bicyclocperoxides 2: 11 percent / CCl4 / 1 h / 160 °C View Scheme

oxygen; 5,15,10,20-tetraphenylporphyrin in tetrachloromethane; chloroform T=0°C; 7 h; Irradiation;