1: 83 percent / NH4Cl / methanol / 12 h / 55 - 60 °C 2: 7 percent / NaCl, NaOCl / dimethylsulfoxide; hexane; diethyl ether / 1.) 0 deg C, 1.5 h, 2.) room temp, 20 min. 3: NaN3, 2-nitropropane sodium salt / dimethylsulfoxide / 0.01 h / 17 °C View Scheme