1: 65 percent / Zn / acetic acid 2: 95 percent / diisobutylaluminum hydride / toluene / -78 °C 3: 72 percent / CH2Cl2 4: 63 percent / BaO / toluene / Heating; further reagent 5: Zn, AcOH / H2O / 70 °C 6: Na2CO3 / tetrahydrofuran / 0 °C 7: 87 percent / Ba(OH)2 / dioxane; H2O / Heating 8: SOCl2 / diethyl ether 10: 76 percent / NaBH4 / dimethylformamide / 80 °C 11: 85 percent / aq. HBr View Scheme