1.1: sodium nitrite; hydrogenchloride / water / 0.5 h / 0 - 5 °C 1.2: 4 h / 5 - 20 °C 2.1: dihydrogen peroxide; sodium carbonate / acetone / 1 h / 5 - 20 °C View Scheme

palladium 10 on activated carbon; hydrogen in ethanol P=2068.65 Torr;