2,4-Diacetylphloroglucinol

synthetischePreparation by Friedel–Crafts acylation of phloroglucinol, with acetic acid, – by using boron trifluoride-acetic acid complex at 28–30° for 18 h (85%)with acetic anhydride, – in the presence of boron trifluoride-ethyl ether complex at 20° for 1 h (80%) – in the presence of zinc chloride at 145–150° for 15 min (25%); – in the presence of concentrated sulfuric acid (24%) with acetyl chloride, – (4 equiv.) in the presence of ferric chloride – in ethyl ether in the presence of aluminium chloride at r.t. for 5 days (8).