1: sodium ethoxide / ethanol / 6 h / Heating 2: 28 percent / toluene / 6 h / Heating View Scheme

1: SOCl2 / benzene / 1) 1h room temperature 2) 1.5 h reflux 2: 94 percent / dimethylformamide / 3.5 h / 80 °C 3: 88 percent / NaOH / H2O / 2 h / Heating 4: sodium ethoxide / ethanol / 6 h / Heating 5: 28 percent / toluene / 6 h / Heating View Scheme

1: 90 percent / NaOH / ethanol; H2O / 2 h / Heating 2: SOCl2 / benzene / 1) 1h room temperature 2) 1.5 h reflux 3: 94 percent / dimethylformamide / 3.5 h / 80 °C 4: 88 percent / NaOH / H2O / 2 h / Heating 5: sodium ethoxide / ethanol / 6 h / Heating 6: 28 percent / toluene / 6 h / Heating View Scheme

1: 88 percent / NaOH / H2O / 2 h / Heating 2: sodium ethoxide / ethanol / 6 h / Heating 3: 28 percent / toluene / 6 h / Heating View Scheme

in toluene 6 h; Heating;