1: With hydrazine hydrate; potassium hydroxide in ethylene glycol T=130°C; 3.5 h; Reflux; 2: With hydrogenchloride in water; ethylene glycol T=20°C;

1.1: 1,4-dioxane; triton B surfactant / 3 h / 20 °C 2.1: hydrogenchloride; water; acetic acid / 16 h / 20 °C / Reflux; Inert atmosphere 3.1: potassium hydroxide; hydrazine hydrate / ethylene glycol / 3.5 h / 130 °C / Reflux 3.2: 20 °C View Scheme

1.1: hydrogenchloride; water; acetic acid / 16 h / 20 °C / Reflux; Inert atmosphere 2.1: potassium hydroxide; hydrazine hydrate / ethylene glycol / 3.5 h / 130 °C / Reflux 2.2: 20 °C View Scheme