1: 43 percent / butan-1-ol / 24 h / 90 °C 2: 84.5 percent / PPh3, DEAD / tetrahydrofuran / Ambient temperature 3: 71 percent / H2, phosphoric acid, KOH / Pd/C / H2O; tetrahydrofuran / 6 h / 0 - 55 °C / 760 Torr 4: 88.8 percent / Br2, NaOAc / acetic acid / Ambient temperature 5: 80 percent / K2CO3 / acetonitrile / 75 °C 6: 75.7 percent / various solvent(s) / 2.5 h / 200 °C 7: 94.5 percent / n-BuLi / tetrahydrofuran / -65 °C 8: 23.53 g / PPA / 2 h / 85 - 90 °C 9: 62 percent / MnO2 / CH2Cl2; acetic acid / 5.5 h / -10 °C / other reagent, solvent, temperature, reaction time View Scheme

zinc(II) iodide in benzene 1.5 h; Heating;