1: KOH / H2O / 48 h / Heating 2: H2SO4 / H2O / 72 h / pH 1 / Heating 3: 4.75 g / H2SO4 / 12 h / 20 °C View Scheme

1.1: KOH / H2O / 48 h / Heating 2.1: H2SO4 / H2O / 72 h / pH 1 / Heating 3.1: 4.75 g / H2SO4 / 12 h / 20 °C 4.1: 100 percent / LiAlH4 / tetrahydrofuran / 1.5 h / 0 - 20 °C 5.1: 87 percent / DMSO; oxalyl chloride; Et3N / CH2Cl2 / -78 - 20 °C 6.1: n-BuLi / tetrahydrofuran; hexane / 0.33 h / 0 °C 6.2: 88 percent / tetrahydrofuran; hexane / 1.5 h / -78 °C 7.1: 67 percent / P2O5 / 20 h / 20 °C 8.1: 28 percent / KOMe / cyclohexane / 16 h / 80 °C View Scheme

1.1: KOH / H2O / 48 h / Heating 2.1: H2SO4 / H2O / 72 h / pH 1 / Heating 3.1: 4.75 g / H2SO4 / 12 h / 20 °C 4.1: 100 percent / LiAlH4 / tetrahydrofuran / 1.5 h / 0 - 20 °C 5.1: 87 percent / DMSO; oxalyl chloride; Et3N / CH2Cl2 / -78 - 20 °C 6.1: n-BuLi / tetrahydrofuran; hexane / 0.33 h / -78 °C 6.2: 96 percent / tetrahydrofuran; hexane / 1 h / -78 °C 7.1: PBr3; pyridine / CH2Cl2 / 1 h / 20 °C 8.1: 60 percent / t-BuOK / cyclohexane / 16 h / 80 °C View Scheme