sodium hydride in tetrahydrofuran T=65°C;

potassium hydroxide in diethylene glycol 15 h; Heating;

1: p-toluenesulfonic acid monohydrate / benzene / 5 h / Heating 2: 1.) potassium t-butoxide / 1.) t-BuOH, RT, 5 min, 2.) t-BuOH, reflux, 1.5 h 3: aq. KOH / bis-(2-hydroxy-ethyl) ether / 15 h / Heating View Scheme

1: 1.) potassium t-butoxide / 1.) t-BuOH, RT, 5 min, 2.) t-BuOH, reflux, 1.5 h 2: aq. KOH / bis-(2-hydroxy-ethyl) ether / 15 h / Heating View Scheme