1.1: hydrazine hydrate / ethanol / 4 h / Reflux 2.1: hydrogen / palladium 10 on activated carbon / ethanol; water / 12 h / 20 °C / 760.05 Torr 3.1: triethylamine / dichloromethane / 3 h / 0 - 20 °C 4.1: hydrogenchloride; water; acetic acid / 1 h / 25 °C 4.2: pH 9 / Cooling with ice View Scheme