organic compounds
Open access
In the title compound, C16H11NO4, the dihedral angle between the 10-membered coplanar chromone ring system and the benzene ring is 77.83 (3)°. In the crystal, weak C—HO hydrogen bonds link the molecules into a three-dimensional network.
organic compounds
Open access
In the biologically active title compound, C26H26O5, the pyran ring of the chromene unit adopts a half-chair conformation. The C=C double bond of the propenone unit exhibits a trans conformation and the carbonyl group is syn conformation to the double bond. The dihedral angle between the benzene ring and the benzopyranone moiety is 31.54 (4)°. The molecular structure is stabilized by an intramolecular C=OH—O hydrogen bond.
organic compounds
Open access
In the title compound, C16H11NO4, the dihedral angle between the ten-membered chromen-4-one ring system (r.m.s. deviation = 0.0095 Å) and the benzene ring is 86.16 (5)°. In the crystal, molecules are linked into a three-dimensional network by weak C—HO hydrogen bonds. The crystal studied was a non-merohedral twin, with the minor twin component refining to 0.093 (1).