potassium permanganate; water; sodium hydroxide T=80 - 90°C;

1: 73 percent / hydrazine hydrate / ethanol / 10 h / Heating 2: 16 percent / sodium hydroxide, potassium permanganate / H2O / 2 h / Heating View Scheme

1.1: diisopropylamine; n-butyllithium / hexane; tetrahydrofuran / 3 h / -70 °C / Inert atmosphere 1.2: 3 h / -70 °C 1.3: -40 °C 2.1: chromium(VI) oxide / acetone / 3 h / -30 - 20 °C / Inert atmosphere 3.1: hydrazine hydrate / ethanol / 12 h / Reflux 4.1: sodium hydroxide / water / 0.17 h / 20 °C 4.2: 80 °C 4.3: pH 2 View Scheme

1.1: chromium(VI) oxide / acetone / 3 h / -30 - 20 °C / Inert atmosphere 2.1: hydrazine hydrate / ethanol / 12 h / Reflux 3.1: sodium hydroxide / water / 0.17 h / 20 °C 3.2: 80 °C 3.3: pH 2 View Scheme

1: acetic acid, 30percent hydrogen peroxide / 10 h / 50 °C 2: POCl2 / 6 h / Heating 3: 73 percent / hydrazine hydrate / ethanol / 10 h / Heating 4: 16 percent / sodium hydroxide, potassium permanganate / H2O / 2 h / Heating View Scheme

1: POCl2 / 6 h / Heating 2: 73 percent / hydrazine hydrate / ethanol / 10 h / Heating 3: 16 percent / sodium hydroxide, potassium permanganate / H2O / 2 h / Heating View Scheme

1: sulfuric acid / 6 h / Reflux; Inert atmosphere 2: sodium acetate; bromine; acetic acid / 120 °C / in a sealed tube View Scheme

1.1: sulfuric acid / 6 h / Reflux; Inert atmosphere 2.1: sodium acetate; bromine; acetic acid / 120 °C / in a sealed tube 3.1: sodium hydroxide; water / 3 h / 90 °C 3.2: 0 °C View Scheme

hydrogenchloride T=18 - 25°C;

sulfuric acid 6 h; RefluxInert atmosphere;