1: 76 percent / MgO, H2O / dioxane / 1.25 h / Heating 2: hydrazine hydrate / ethane-1,2-diol 3: 50 percent / ammonium chloride, ammonium hydroxide / 2.5 h / 184 °C / 19341.3 Torr View Scheme

water; magnesium oxide in 1,4-dioxane 1.25 h; Heating;