potassium carbonate in benzene 1 h; Ambient temperature;

P2O5 in benzene 1.16667 h; Heating;

1: phosphorus pentoxide / benzene / 1.17 h / Heating 2: 55 percent / formamide / 3 h / Heating 3: 20 percent / KOH / ethanol / 45 h / Heating 4: 84 percent / 85percent formic acid / 2 h / Heating View Scheme

1: phosphorus pentoxide / benzene / 1.17 h / Heating 2: 55 percent / formamide / 3 h / Heating 3: 20 percent / KOH / ethanol / 45 h / Heating View Scheme