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addenda and errata
organic compounds
The 9,10-anthraquinone ring system of the title compound, C25H26O5, is essentially planar. The O-geranyl substituent is at the meta position with respect to the hydroxyl group. O—H
O intramolecular hydrogen bonds are observed in the molecular structure. The molecules form centrosymmetric hydrogen-bonded dimers via intermolecular C—HO hydrogen bonds which generate rings of motif R22(10). The crystal structure is further stabilized by weak π–π interactions.
O intramolecular hydrogen bonds are observed in the molecular structure. The molecules form centrosymmetric hydrogen-bonded dimers via intermolecular C—HO hydrogen bonds which generate rings of motif R22(10). The crystal structure is further stabilized by weak π–π interactions. organic compounds
The title compound, C23H22O6·CH3OH, has an essentially planar xanthone nucleus fused to a chromene ring which adopts a sofa conformation. The 3-methylbut-2-enyl substituent is axially attached to the xanthone ring system, with a (+)-anticlinal conformation. The crystal structure is stabilized by O—HO and C—HO intramolecular and intermolecular interactions.
O and C—HO intramolecular and intermolecular interactions.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—HO 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, C24H26O6, is a caged-polyprenylated xanthone which has been isolated for the first time from the roots of C. cochinchinese. The cyclohexane ring adopts a standard boat conformation, the cyclohexene rings are in twisted boat and twist-boat conformations, and the tetrahydrofuran ring has an envelope conformation. The structure is stabilized by intramolecular C—HO and O—HO hydrogen bonds. C—HO intermolecular hydrogen bonds and C—Hπ stacking interactions link the molecules into molecular sheets parallel to the bc plane.
O and O—HO hydrogen bonds. C—HO intermolecular hydrogen bonds and C—Hπ stacking interactions link the molecules into molecular sheets parallel to the bc plane.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 title compound, C17H14O5, a flavone, was isolated from the rhizomes of Kaempferia parviflora. The benzopyran-4-one ring system and the methoxyphenyl substituent are approximately coplanar. The molecules are linked via intermolecular C—HO hydrogen bonds to form chains.
O hydrogen bonds to form chains.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, C24H26O6·CHCl3, which we named prunifloxanthone A, was isolated for the first time from the roots of Cratoxylum formosum ssp. pruniflorum and has never been isolated from any other natural resources as yet. The xanthone ring systems of the molecules are stacked along the a axis, with significant π–π interactions. In addition, O—HO hydrogen bonds link glide-related molecules into a chain along [201].
O hydrogen bonds link glide-related molecules into a chain along [201].
