acetic anhydride 24 h; Heating;

1: 89 percent / ethanol / 1 h / Ambient temperature 2: 86 percent / 5percent NaHCO3 / H2O / 0.08 h / Heating 3: 75 percent / acetic anhydride / 24 h / Heating View Scheme

sulfuric acid 1.5 h; Heating;