1: 74 percent / sodium nitrite, hydrochloric acid / H2O / 0.5 h / 0 - 5 °C 2: 2 percent / dimethylsulfoxide / 72 h / Heating View Scheme

1: 74 percent / sodium nitrite, hydrochloric acid / H2O / 0.5 h / 0 - 5 °C 2: 2 percent / dimethylsulfoxide / 72 h / Heating 3: 75 percent / n-butyllithium / diethyl ether; hexane / 1.) 0 deg C, 1 h, 2.) room temperature, 30 min View Scheme