1: With hydrogenchloride; anhydrous iron chloride in water; acetic acid T=50°C; 0.25 h; 2: With potassium dichromate; sulfuric acid in water; acetic acid T=80 - 90°C; 0.25 h;

potassium dichromate; iron(III) chloride in acetic acid

potassium dichromate; iron(III) chloride in acetic acid

1.1: sodium hydroxide; sodium nitrite / 0 °C 1.2: 0 °C 1.3: 2 h / pH 6-7 2.1: water; sodium dithionite; sodium hydroxide / 1 h / 90 °C 3.1: anhydrous iron chloride; hydrogenchloride / water; acetic acid / 0.25 h / 50 °C 3.2: 0.25 h / 80 - 90 °C View Scheme