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Synthesis of new fused phosphorus heterocyclic derivatives, phosphabenzo[a]anthracene-7-ones, is accomplished by a new methodology involving Friedel-Crafts insertion of phosphorus trichloride into 3-flavanol in the presence of ZnCl2 as a catalyst and subsequent reaction of the resultant chloroxaphosphorin with various alcohols in the presence of triethylamine, followed by oxidation with H2O2. The structures were determined by IR, 1 H, 13 C, 31 P NMR and mass spectral

Synthesis of novel fused heterocyclic system: 5-(substituted)-5-oxo-5H-6,12-dioxa-5λ5–phosphabenzo (a) anthracene-7-ones