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

toluene-4-sulfonic acid in benzene 5 h; Heating; Yield given;