1: 63 percent / NaNO2, glacial acetic acid / H2O / 1 h / Heating 2: 82.5 percent / butyl alcohol / 8 h / Heating 3: 60 percent / hydrazine hydrate / Raney nickel / dimethylformamide / 5 h / 60 - 70 °C 4: 1) 10percent NaNO2, 6 N hydrochloric acid, 2) CuCl View Scheme

T=170°C; 0.333333 h;

T=160°C; 6.5 h;