2,3-Dihydro-8-hydroxy-5,7-dimethoxy-2-phenyl-4H-1-benzopyran-4-one and 3,3,6-Tribromo-2,3-dihydro-8-hydroxy-5,7-dimethoxy-2-phenyl-4H-1-benzopyran-4-one

In title molecules, C₁₇H₁₆O₅, (I), and C₁₇H₁₃Br₃O₅, (II), the dihyropyran ring adopts sofa and half-chair conformation, respectively. The heterocyclic ring is distorted from planarity and the phenyl rings form dihedral angles of 72.3 (4)° (I) and 60.5 (3)° (II) with the dihydropyran ring. In both structures, the hydroxyl oxygen involves in O-H...O intramolecular hydrogen bond.

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