1: 76.1 percent / SOCl2 / 0.67 h / 40 °C 2: 82.6 percent / AcONa, acetic anhydride / 3 h 3: 62.5 percent / ethanol / 16 h / Heating 4: 1 M aq. NaOH / acetone / 1 h / -20 - -15 °C 5: 0.5 M H2SO4 / acetone / 0.5 h / Ambient temperature 6: 5 M H2SO4 / 6 h / 45 - 47 °C View Scheme