1: 22 percent / hydrazine hydrate, KOH / bis-(2-hydroxy-ethyl) ether / 3 h / Heating 2: 92 percent / 5percent aq. HCl / tetrahydrofuran / 1 h / Ambient temperature View Scheme

1: 22 percent / hydrazine hydrate, KOH / bis-(2-hydroxy-ethyl) ether / 3 h / Heating 2: 92 percent / 5percent aq. HCl / tetrahydrofuran / 1 h / Ambient temperature 3: 86 percent / pyridine / 5 h / 0 °C View Scheme