title: Friedel-crafts acylation yclisation reactions of 3-bromophenyl ethers with phosphorus trichloride and oxalyl chloride to give the corresponding phenoxaphosphine and xanthen-1-one derivatives.
mesh_terms: D000215:Acylation; D003500:Cyclization; D013058:Mass Spectrometry; D010070:Oxalates; D010720:Phosphines / Q000138:chemical synthesis*; D013056:Spectrophotometry, Ultraviolet; D014966:Xanthenes / Q000138:chemical synthesis*
chemical_list: D010070:Oxalates; D010720:Phosphines; D014966:Xanthenes