1: 83 percent / sodium ethoxide / ethanol / 24 h / Heating 2: 87 percent / phosphorus pentachloride, phosphoryl chloride / 3 h / Heating 3: potassium t-butoxide / 1.5 h / Heating View Scheme

1: 87 percent / phosphorus pentachloride, phosphoryl chloride / 3 h / Heating 2: potassium t-butoxide / 1.5 h / Heating View Scheme

potassium tert-butylate 1.5 h; Heating;