1: HgBr2 / 5 h / 95 °C / 5 Torr 2: 2.4 g / 0.01 percent NaOMe / methanol / 3 h / Ambient temperature 3: 840 mg / silver triflate, 2,4,6-collidine / CH2Cl2 / 5 h / 0 °C 4: 0.01 percent NaOMe / methanol / 3 h / Ambient temperature 5: NaH / dimethylformamide / 3 h / Ambient temperature 6: 45 percent / liq. NH3, Na metal / tetrahydrofuran / 3 h / -30 °C 7: 1.) NaIO4, 2.) CaCO3 / 1.) H2O, RT, 16 h, 2.) RT, 24 h, View Scheme

1: HgBr2 / 5 h / 95 °C / 5 Torr 2: 2.4 g / 0.01 percent NaOMe / methanol / 3 h / Ambient temperature 3: 840 mg / silver triflate, 2,4,6-collidine / CH2Cl2 / 5 h / 0 °C 4: 0.01 percent NaOMe / methanol / 3 h / Ambient temperature 5: NaH / dimethylformamide / 3 h / Ambient temperature 6: 45 percent / liq. NH3, Na metal / tetrahydrofuran / 3 h / -30 °C View Scheme