1: 96 percent / CaCO3, HgCl2 / acetonitrile; H2O / 1 h / Ambient temperature 2: 1) Mg / 1) ether, 2) 0 deg C, 15 min 3: 90 percent / p-toluenesulphonic acid / methanol / 4 h / Heating View Scheme

1: 96 percent / CaCO3, HgCl2 / acetonitrile; H2O / 1 h / Ambient temperature 2: 1) Mg / 1) ether, 2) 0 deg C, 15 min 3: 90 percent / p-toluenesulphonic acid / methanol / 4 h / Heating 4: 92 percent / pyridinium chlorochromate / CH2Cl2 / 4 h / Ambient temperature View Scheme

1.1: 90 percent / HgCl2; CaCO3 / acetonitrile; H2O / 2 h / 20 °C 2.1: Mg / diethyl ether 2.2: 90 percent / diethyl ether / 2.5 h / Heating 3.1: 85 percent / TsOH / methanol / 4 h / Heating 4.1: 0.5 g / Ag2CO3 / methanol; benzene / 6 h / Heating View Scheme