1: 83 percent / H2O; 2-methyl-propan-2-ol / 1)15 min steam bath 2)room temp. 2h 2: 92.4 percent / conc. H2SO4 / 2 h / Ambient temperature 3: 81.9 percent / conc. H2SO4 / ethane-1,2-diol / 0.5 h / 130 °C View Scheme