1: 38 percent / sodium / toluene / 5 h / Heating 2: HCl / tetrahydrofuran / 10 h / Ambient temperature 3: zinc dust, acetic acid, HCl / 75 - 80 °C 4: KOH, hydrazine hydrate / bis-(2-hydroxy-ethyl) ether / 1.) reflux, 2 h, 2.) 210 deg C, 2 h View Scheme