sodium hydroxide 2 h; Ambient temperature;

With  hydrogenchloride; sodium nitrite in  water T=0°C; 3 h;   

With  hydrogenchloride; sodium nitrite in  water T=0°C; 3 h;   

Multi-step reaction with 3 steps 1: 71 percent / pyridine / 3.5 h / Heating2: 67 percent / NH2OH / methanol / 0.5 h / Heating3: 83 percent / conc. HCl/Na2NO2 / H2O / 3 h / 0 °C  

Multi-step reaction with 3 steps 1: 89 percent / 5 percent NaOH, aq. / 19 h / Ambient temperature2: 67 percent / NH2OH / methanol / 0.5 h / Heating3: 83 percent / conc. HCl/Na2NO2 / H2O / 3 h / 0 °C