3-[(2-Phenylsulfonyl)ethenyl]-4H-1-benzopyran-4-one

In the title compound, C₁₇H₁₂O₄S, the bond distances reflect electron delocalization in the O4-C10=C9-C8=C7 chain. The molecule contains three nearly planar segments, namely, the benzopyranone group, the phenyl ring and the ethylene group. The sulfonyl plane is inclined at an angle of 84.6 (2)° to the plane of the ethylene group, including its immediate substituents, and at an angle of 14.4 (1)° to the benzopyranone group. In the structure of the related compound 3-[2-(4-chlorophenylsulfonyl)ethenyl]-4H-1-benzopyran-4-one [Krishnaiah, Narayana Raju, Lu, Chen & Narasinga Rao (1995). Acta Cryst. C51, 2429-2430], the corresponding angles are 60.3 (2) and 51.5 (2)°, respectively.