1: silver trifluoromethanesulphonate / tetrahydrofuran; diethyl ether / 3.5 h / -3 °C 2: 71.5 percent / 0.1 M aq. NaOH / CH2Cl2; methanol / 0.33 h / 0 °C 3: 0.1 M NaOH / H2O / 0.5 h / Ambient temperature View Scheme

1: 51 percent / Silver triflate 2: 0.1 mol dm-3 NaOH / CH2Cl2; methanol / 0.5 h / 0 °C 3: 77 percent / 0.1 mol dm-3 NaOH / H2O / 0.5 h / Ambient temperature View Scheme

1: 28 percent / Hg(CN)2, HgBr2, molecular sieves 3 Angstroem / CHCl3 / 38 h / Ambient temperature 2: 41 percent / aq. 80percent AcOH / 40 h / 45 °C 3: 82 percent / 0.1N NaOH / CH2Cl2; methanol / 0.33 h / 0 °C 4: 95 percent / 0.1N NaOH / 0.33 h / Ambient temperature View Scheme