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In the title mol­ecule, C18H18O4, the dihedral angle between the benzene rings is 52.52 (7)°. The C=C bond of the central enone group adopts a trans conformation. The relative conformation of the two double bonds in the enone group is s-transoid. In the crystal, mol­ecules are linked by pairs of weak C—H...O hydrogen bonds, forming inversion dimers.

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In the title mol­ecule, C22H20O5, the C=C bond of the central enone group adopts an E conformation. The dihedral angle formed by the benzene ring and the naphthalene ring system is 12.6 (4)°. The hy­droxy group attached to the naphthalene ring is involved in an intra­molecular O—H...O hydrogen bond. In the crystal, weak C—H...O hydrogen bonds link the mol­ecules into chains along [010]. In addition, π–π stacking inter­actions are present, with centroid–centroid distances of 3.6648 (15) and 3.8661 (15) Å between the benzene and two naphthalene rings.
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