hydrogenchloride; tin(ll) chloride in methanol T=60°C; 4 h;

in benzene T=120°C; 2 h;

1: 89 percent / 97 percent sodium azide / dimethylformamide / 8 h / 85 °C 2: 34 percent / tin(II) chloride dihydrate, 12 N HCl / methanol / 4 h / 60 °C View Scheme