1: tetrahydrofuran / 0 - 20 °C 2: toluene / 35 h / 200 °C 3: K2CO3 / 14 h / Ambient temperature 4: 76 percent / Mg, MeOH / 2.5 h / Heating 5: t-BuOK / benzene / 5 h / Heating 6: AcOH, aq. HCl / 1 h / Heating 7: 5percent aq. NaOH / methanol / 1 h / Heating 8: aq. Hg(ClO4)2 / tetrahydrofuran / 1 h / Ambient temperature View Scheme