Crystal structure of 2-(3,4-dimethoxyphenyl)-3-hydroxy-4H-chromen-4-one

In the title compound, C 17 H 14 O 5 , the dimethoxy-substituted benzene ring is twisted relative to the 4 H -chromenon skeleton (r.m.s. deviation = 0.015 Å) by 5.2 (4)°. The C atoms of the methoxy groups lie close to the plane of their attached benzene ring [deviations = 0.036 (3) and 0.290 (3)Å for the meta and para substituents, respectively]. An intramolecular O—H...O hydrogen bond closes an S (5) ring. In the cystal, inversion dimers linked by pairs of O—H...O hydrogen bonds generate R 2 2 (10) loops and C—H...O interactions connect the dimers into [010] chains.

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