hydrogenchloride; mercury; zinc in toluene T=120°C; 4 h;

1: 74 percent / NaOAc / 4 h / 120 °C 2: 95 percent / 0.2 N HCl / 1 h / 80 °C 3: 83 percent / 3 N HCl / 6 h / 100 °C View Scheme