1: 81 percent / H2O / 0 °C 2: 66 percent / 30percent hydrogen peroxide / acetic acid / 1.) 55-60 deg C, 2 h, 2.) 75-80 deg C, 15 h 3: 85 percent / 10percent aq. sodium hydroxide / 4 h / Heating 4: 1.) sodium nitrite, conc. HCl 2.) sodium azide / 1.) water 5: 2.4 percent / various solvent(s) / 4 h / 185 °C View Scheme