1: 70 percent / ethanol; H2O / 70 °C / stirring overnight at 70 deg C 2: 74 percent / n.BuLi; diisobutylaluminium (DIBAL); sodium borohydride / tetrahydrofuran; hexane; ethanol / 4 h / -78 - 0 °C / warming to room temperature over 1 h 3: 65 percent / sulfuric acid / aq. ethanol / 24 h / reflux View Scheme