1: 1) Fe-powder, 37percent HCl, 2) 34 percent anh. HCl / 1) EtOH, 30 min, reflux, 2) EtOH 2: AcONa / acetic acid; H2O / 48 h / 0 - 3 °C 3: 3percent aq. Na2CO3 / 96 h / Ambient temperature 4: 37percent HCl / H2O / 5 h / Heating; without reagent, solvent, different temperature; other educts and products View Scheme

1: AcONa / acetic acid; H2O / 48 h / 0 - 3 °C 2: 3percent aq. Na2CO3 / 96 h / Ambient temperature 3: 37percent HCl / H2O / 5 h / Heating; without reagent, solvent, different temperature; other educts and products View Scheme

1: 3percent aq. Na2CO3 / 96 h / Ambient temperature 2: 37percent HCl / H2O / 5 h / Heating; without reagent, solvent, different temperature; other educts and products View Scheme

sulfuric acid 1. aq. acetic acid, 5 h, reflux; 2. aq. NH3; Yield given. Multistep reaction;

1: 1. NaNO2, 37percent HCl / 1. H2O, 0 deg C; 2. 0 deg C, 2 h 2: 100 percent / pyridine / 1. 0 deg C, 2 h; 2. room temperature, 20 h 3: 1. H2SO4 / 1. aq. acetic acid, 5 h, reflux; 2. aq. NH3 View Scheme

1: 1. NaNO2, 37percent HCl / 1. H2O, 0 deg C; 2. 0 deg C, 2 h 2: 100 percent / pyridine / 1. 0 deg C, 2 h; 2. room temperature, 20 h 3: 1. H2SO4 / 1. aq. acetic acid, 5 h, reflux; 2. aq. NH3 View Scheme

1: 100 percent / pyridine / 1. 0 deg C, 2 h; 2. room temperature, 20 h 2: 1. H2SO4 / 1. aq. acetic acid, 5 h, reflux; 2. aq. NH3 View Scheme

hydrogenchloride in water 5 h; Heating; Yield given;