1: With methanol; potassium hydroxide 8 h; Heating; 2: With hydrogenchloride pH=2 - 3; 6 h; Heating;

1.1: 52 percent / hydrazine hydrate / methanol / 2 h / 20 °C 2.1: 75 percent / aq. K2CO3 / 3 h / Heating 3.1: aq. KOH; MeOH / 8 h / Heating 3.2: 95 percent / aq. HCl / 6 h / pH 2 - 3 / Heating View Scheme

1.1: 75 percent / aq. K2CO3 / 3 h / Heating 2.1: aq. KOH; MeOH / 8 h / Heating 2.2: 95 percent / aq. HCl / 6 h / pH 2 - 3 / Heating View Scheme

calcium hydroxide powder in 1,4-dioxane 2 h; Heating;