1: With hydrogenchloride; sodium nitrite in water; acetic acid T=0°C; 0.0833333 h; 2: With potassium iodide in water; acetic acid T=60°C; 1 h;

1.1: 91 percent / aq. HCl / 3 h / 90 °C 2.1: HCl; NaNO2 / H2O; acetic acid / 0.08 h / 0 °C 2.2: 43 percent / KI / H2O; acetic acid / 1 h / 60 °C View Scheme

1.1: 17 g / ethanol / 16 h / 20 °C 2.1: 14 g / potassium permanganate; MgSO4 / acetone; H2O / 16 h / 20 °C 3.1: 91 percent / aq. HCl / 3 h / 90 °C 4.1: HCl; NaNO2 / H2O; acetic acid / 0.08 h / 0 °C 4.2: 43 percent / KI / H2O; acetic acid / 1 h / 60 °C View Scheme

1.1: 14 g / potassium permanganate; MgSO4 / acetone; H2O / 16 h / 20 °C 2.1: 91 percent / aq. HCl / 3 h / 90 °C 3.1: HCl; NaNO2 / H2O; acetic acid / 0.08 h / 0 °C 3.2: 43 percent / KI / H2O; acetic acid / 1 h / 60 °C View Scheme