1: 63 percent / NaOEt / 7 h / Heating 2: 98 percent / KOH / ethanol; H2O / 6 h / Heating 3: 95 percent / 170 °C 4: thionyl chloride / 0.75 h / Heating 5: 85 percent / AlCl3 / CS2 / 3 h / Heating 6: 89 percent / NaBH4 / ethanol; tetrahydrofuran 7: 96 percent / p-toluenesulfonic acid / benzene / Heating 8: 97 percent / NiCl2<dppp>2 / diethyl ether / Heating 9: 98 percent / H2 / PtO2 / tetrahydrofuran / 1034.3 Torr View Scheme