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organic compounds
The title compound, C17H14O5, a flavone, was isolated from the rhizomes of Kaempferia parviflora. There are two crystallographically independent molecules in the asymmetric unit. The molecular structure is stabilized by intramolecular O—H
O and C—HO hydrogen bonds. C—HO intermolecular hydrogen bonds and π–π stacking interactions link the molecules into a network.
O and C—HO hydrogen bonds. C—HO intermolecular hydrogen bonds and π–π stacking interactions link the molecules into a network.organic compounds
The title compound, C17H18O5, was isolated from the leaves of Rauwenhoffia siamensis Scheff. There are two crystallographically independent molecules in the asymmetric unit. The dihedral angle between the two benzene rings is 80.81 (7)° in one molecule and 65.89 (7)° in the other. The symmetry-related molecules are linked via O—HO intermolecular hydrogen bonds to form chains along [201].
O intermolecular hydrogen bonds to form chains along [201].organic compounds
The title compound, C18H16O5, a flavone, was isolated from the rhizomes of Kaempferia parviflora. The phenyl substituent is twisted away from the plane of the benzopyran-4-one ring system by 31.05 (4)°. The crystal structure is stabilized by π–π stacking interactions between the benzopyran-4-one ring system of inversion-related molecules stacked along the a axis and C—HO interactions between the screw-related molecules.
O interactions between the screw-related molecules.organic compounds
The non-H atoms of the title compound, C15H10O4, which was isolated from the roots of Prismatomeris malayana Ridl., are coplanar. Intramolecular O—HO and C—HO hydrogen bonds are observed in the molecular structure. The molecules form centrosymmetric hydrogen-bonded dimers via intermolecular O—HO hydrogen bonds. The crystal structure is further stabilized by weak π–π interactions.
O and C—HO hydrogen bonds are observed in the molecular structure. The molecules form centrosymmetric hydrogen-bonded dimers via intermolecular O—HO hydrogen bonds. The crystal structure is further stabilized by weak π–π interactions.organic compounds
The asymmetric unit of the title compound, C7H11N2+·ClO4−, contains a 4-(N,N-dimethylamino)pyridinium cation and a perchlorate anion linked via an N—HO hydrogen bond. Glide-related molecules are linked by C—HO hydrogen bonds to form a chain along the c axis. The chains are arranged to form a layered structure parallel to the bc plane.
O hydrogen bond. Glide-related molecules are linked by C—HO hydrogen bonds to form a chain along the c axis. The chains are arranged to form a layered structure parallel to the bc plane.organic compounds
The title compound, C17H14O4·CHCl3, was isolated from the rhizomes of Kaempferia parviflora. The benzopyran-4-one ring system and the phenyl substituent are approximately coplanar. The crystal structure is stabilized by π–π stacking interactions between the benzopyran-4-one ring system of inversion-related molecules stacked along the c axis, and C—HO and C—Hπ interactions.
O and C—Hπ interactions.organic compounds
The title compound, C17H12O6, forms an infinite one-dimensional zigzag-like chain developing parallel to the b axis through O—HO hydrogen bonds. The chains are stacked along the c axis. The crystal structure is further stabilized by weak π–π and C—Hπ interactions.
O hydrogen bonds. The chains are stacked along the c axis. The crystal structure is further stabilized by weak π–π and C—Hπ interactions.
