1: 94 percent / CuI / diethyl ether / 4 h / Ambient temperature 2: pyridine / 20 h / 0 °C 3: 75 percent / HgBr2, Mg / diethyl ether / 6 h 4: Bu3SnH, azobis<isobutyronitrile> (AIBN) / benzene / 1.5 h / Heating; also without solvent, at 75 deg C View Scheme

1: 94 percent / CuI / diethyl ether / 4 h / Ambient temperature 2: pyridine / 20 h / 0 °C 3: 75 percent / HgBr2, Mg / diethyl ether / 6 h 4: Bu3SnH, azobis<isobutyronitrile> (AIBN) / benzene / 1.5 h / Heating; also without solvent, at 75 deg C View Scheme

1: 94 percent / CuI / diethyl ether / 4 h / Ambient temperature 2: pyridine / 20 h / 0 °C 3: 75 percent / HgBr2, Mg / diethyl ether / 6 h View Scheme

copper(l) iodide in diethyl ether 4 h; Ambient temperature;