1: sodium azide; iodine cloride / acetonitrile / 12 h / 20 °C / |Cooling with ice 2: potassium tert-butylate / diethyl ether / 4 h / 0 °C / |Cooling with ice 3: chloroform / 10 h / |Inert atmosphere; |Photolysis View Scheme

1: benzene / 4.5 h / Irradiation 3: 42 percent / xylene / 35 h / 138 °C View Scheme

pyridine; hydrogen fluoride in benzene T=20°C; 1 h; other solvents, other azirines, solvent effect;