1: 52 percent / POCl3, N,N-diethylaniline / 3 h / Heating 2: NH3 / ethanol 3: NH3 / ethanol / 4 h / 100 °C View Scheme

1: 52 percent / POCl3, N,N-diethylaniline / 3 h / Heating 2: NH3 / ethanol 3: NH3 / ethanol / 4 h / 100 °C 4: 76 percent / iron(II) sulphate, H2O, Ba(OH)2 / 0.33 h / 100 °C View Scheme

N,N-diethylaniline; trichlorophosphate 3 h; Heating;