1: 91.2 percent / 10percent aq. NaOH / diethyl ether / 1 h / 0 - 5 °C 2: 64.7 percent / POCl3 / toluene / 2.5 h / 120 °C 3: 82.4 percent / dimethylformamide / 5 h / 180 °C 4: 40.7 percent / H2O/KOH / bis-(2-hydroxy-ethyl) ether / 24 h / Heating View Scheme