hydrogenchloride; sodium nitrite T=5 - 20°C; 7 h;

hydrogenchloride in water 6 h; Inert atmosphere;

1: 96 percent / hydrazine hydrate / 6 h / Heating 2: 90 percent / NaNO2; conc. HCl / H2O / 6 h / 0 - 20 °C View Scheme

1: 50 percent / n-butyllithium; copper dichloride / diethyl ether; hexane / 0.75 h / -70 °C 2: 96 percent / hydrazine hydrate / 6 h / Heating 3: 90 percent / NaNO2; conc. HCl / H2O / 6 h / 0 - 20 °C View Scheme

tributylphosphine in methanol; water T=20°C; 5 h;