1: With hydrogenchloride; sodium nitrite T=0°C; 0.333333 h; 2: With hydrogenchloride; tin(ll) chloride T=-5°C; 0.5 h; Further stages.;

1.1: NH4Cl; AlMe3 / toluene; xylene / 24 h / Heating 2.1: aq. HCl; NaNO2 / 0.33 h / 0 °C 2.2: SnCl2*2H2O; 6 N aq. HCl / 0.5 h / -5 °C View Scheme