1: 82 percent / anhydr. potassium carbonate / acetone / Heating 2: 93 percent / 1.) anhydr. aluminium bromide; 2.) 2percent HCl / acetonitrile / 1.) 2 h; 2.) 70 - 80 deg C, 20 min 3: 80 percent / anhydr. potassium carbonate / methanol / 2 h / Heating View Scheme