1: 70 percent / sodium ethoxide / ethanol / 24 h / Heating 2: 91 percent / phosphorus pentachloride, phosphoryl chloride / 3 h / Heating 3: 3 h / Heating View Scheme

1: 91 percent / phosphorus pentachloride, phosphoryl chloride / 3 h / Heating 2: 3 h / Heating View Scheme

3 h; Heating;