2,4-Diacetyl-1,3-benzenediol

synthetischeObtained from resorcinol by a typical Friedel– Crafts reaction (40%) , with acetic acid in the presence of boron trifluoride, – at 140° for 3 h in a sealed tube (30%) ; – at 125° for 6 h (20%) ; with acetic anhydride, – in the presence of concentrated sulfuric acid at 130° for 15 min (15%) ; – in the presence of zinc chloride at 145–150° (7%) or at 150–160° for 20 min (6%) ; with acetyl chloride, – by heating in the presence of concentrated sulfuric acid (10%) ; – in ethyl ether in the presence of aluminium chloride at r.t. for 3 days (7%).