potassium carbonate T=60°C; 16 h;

1: 69 percent / HCl / ethanol / 15 h / Ambient temperature 2: 5 percent / HCl / 1.) EtOH, 1 h, RT, 2.) reflux, 18 h 3: 95 percent / (NH4)2Ce(NO3)6 / H2O; acetonitrile / 0.33 h / 0 °C 4: 66 percent / 0.1M K2CO3 / 16 h / 60 °C View Scheme

1: aq. CF3COOH / 1 h / 60 °C 2: nitrobenzene / 1 h / Heating 3: 56 percent / ceric ammonium nitrate / acetonitrile; H2O / 0.17 h / 0 °C 4: 56 percent / aq. K2CO3 / 5 h / 60 °C View Scheme