Scheme 1. Synthesis of 5,6-benzoflavone. Reagents and conditions: (a) MW, ZnCl2, CH3COOH, 20 min; (b) benzoyl chloride, pyridine, stirring, RT, 1 h; (c) KOH, pyridine, warm, 15 min; (d) a drop of conc. H2SO4, CH3COOH, reflux, 30 min.
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