hydrogenchloride in toluene T=20°C; 12 h;

T=110°C; 4 h; reduced pressure;

1: 78 percent / polyphosphoric acid / 4 h / 100 - 110 °C 2: 97 percent / NaNO2 / acetic acid / 3 h / 20 °C 3: 94 percent / Na2S2O4; NaOH / ethanol / 24 h / Heating 4: 98 percent / PbO2 / benzene / 24 h / Heating 5: 56 percent / aq. HCl / toluene / 12 h / 20 °C View Scheme

1: 78 percent / polyphosphoric acid / 4 h / 100 - 110 °C 2: 97 percent / NaNO2 / acetic acid / 3 h / 20 °C 3: 94 percent / Na2S2O4; NaOH / ethanol / 24 h / Heating 4: 98 percent / PbO2 / benzene / 24 h / Heating 5: 56 percent / aq. HCl / toluene / 12 h / 20 °C View Scheme

1: 98 percent / PbO2 / benzene / 24 h / Heating 2: 56 percent / aq. HCl / toluene / 12 h / 20 °C View Scheme

1: 94 percent / Na2S2O4; NaOH / ethanol / 24 h / Heating 2: 98 percent / PbO2 / benzene / 24 h / Heating 3: 56 percent / aq. HCl / toluene / 12 h / 20 °C View Scheme

1: 42 percent / aq. HCl / toluene / 12 h / 20 °C 2: 99 percent / 4 h / 110 °C / reduced pressure View Scheme