PPA T=140°C; 1.5 h;

1: 96 percent / dimethylformamide / 20 °C / electrolysis; anode: platinum, cathode: mercury pool; lithium perchlorate, potential of -1V (vs saturated calomel electrode) 2: 77 percent / aq. 15percent HCl, HgCl2 / 6 h / Heating 3: 86 percent / polyphosphoric acid / 1.5 h / 140 °C View Scheme

1: H2O; methanol 2: 96 percent / dimethylformamide / 20 °C / electrolysis; anode: platinum, cathode: mercury pool; lithium perchlorate, potential of -1V (vs saturated calomel electrode) 3: 77 percent / aq. 15percent HCl, HgCl2 / 6 h / Heating 4: 86 percent / polyphosphoric acid / 1.5 h / 140 °C View Scheme

1: 77 percent / aq. 15percent HCl, HgCl2 / 6 h / Heating 2: 86 percent / polyphosphoric acid / 1.5 h / 140 °C View Scheme