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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, C20H21O7, also known as purpuriol, was isolated for the first time from natural product sources. The cyclohexene ring adopts a half-chair conformation with an axially attached methyl benzoate and equatorially attached benzoyloxy substituents. The methyl benzoate and benzoyloxy groups are essentially planar. The dihedral angle between these groups is 9.2 (2)°. O—HO intermolecular hydrogen bonds link the molecules into chains along the a axis and the chains are interlinked by C—HO hydrogen bonds and C—Hπ interactions.
O intermolecular hydrogen bonds link the molecules into chains along the a axis and the chains are interlinked by C—HO hydrogen bonds and C—Hπ interactions. organic compounds
In the title compound, C15H16NO2+·C6H4BrSO3−, the cation is almost planar. The benzene ring of the anion makes dihedral angles of 82.00 (8) and 74.96 (8)° with the mean planes through the benzene ring of the cation and the pyridinium ring, respectively. In the solid state, the cations and anions are packed as alternate layers parallel to the ac plane. These layers are interconnected through O—HO, C—HO and C—Hπ interactions to form a three-dimensional network.
O, C—HO and C—Hπ interactions to form a three-dimensional network. organic compounds
The title compound, C15H16NO2+·C6H4ClO3S−, is isomorphous with the 4-bromobenzenesulfonate derivative. The cation is almost planar and the benzene ring of the anion makes dihedral angles of 82.79 (1) and 76.39 (1)° with the mean planes through the benzene ring of the cation and the pyridinium ring, respectively. The cations and anions are packed as alternate layers parallel to the ac plane. These layers are interconnected through O—HO, C—HO and C—Hπ interactions to form a three-dimensional network.
O, C—HO and C—Hπ interactions to form a three-dimensional network.organic compounds
The title compound, C40H58O4, a lupane triterpene, was isolated from the hypocotyls of Ceriops tagal (Perr.) C. B. Robinson. There are two crystallographically independent molecules in the asymmetric unit. In both molecules, the cyclopentane ring adopts an envelope conformation. The molecular structure is stabilized by O—HO and C—HO hydrogen bonds. C—HO intermolecular hydrogen bonds link the molecules into chains along the a axis.
O and C—HO hydrogen bonds. C—HO intermolecular hydrogen bonds link the molecules into chains along the a axis.organic compounds
In the title compound, C19H18NO2+. C7H7SO3−, the cation is almost planar and the benzene ring of the anion makes dihedral angles of 59.17 (9) and 60.59 (10)° with the mean planes through the quinolinium and benzene ring of the cation, respectively. The cations and anions are packed as alternate layers along the b axis. These layers are interconnected through O—HO and C—HO interactions to form a three-dimensional network. The structure is stabilized by these interactions and C—Hπ interactions.
O and C—HO interactions to form a three-dimensional network. The structure is stabilized by these interactions and C—Hπ interactions.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, C17H14O4, a homoisoflavanoid, was isolated from the twigs and stems of Caesalpinia digyna Rottler. The pyran ring adopts an envelope conformation. The symmetry-related molecules are linked via O—HO and C—HO intermolecular hydrogen bonds to form a molecular network.
O and C—HO intermolecular hydrogen bonds to form a molecular network.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].
