1: With hydrogenchloride; sodium nitrite in water T=-5°C; 0.416667 h; 2: With potassium iodide in water T=20°C; Sandmeyer reaction; 16 h;

1.1: sodium nitrite; hydrochloric acid / H2O / 0.25 h / -5 °C 1.2: 89 percent / potassium iodide / H2O; CH2Cl2 / 4 h / 20 °C 2.1: 10 percent / tributyltin hydride; 2,2'-diazobisisobutyronitrile / 12 h / Heating View Scheme