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addenda and errata
Corrigendum to Acta Cryst. (2005), E61, o3523–o3525.
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
In the title compound, C18H20O5, one of the four methoxy groups is twisted out of the naphthalene ring plane as a result of steric hindrance. The orientation of the butenone substituent with respect to the attached ring is anticlinal.
organic compounds
The title compound, C17H14O6, has been isolated for the first time from Rhazya stricta. The dihedral angle between the mean planes through the benzopyran ring system and o-anisole group is 59.78 (5)°. The molecular packing is stabilized by O—HO and C—HO hydrogen bonds.
O and C—HO hydrogen bonds.organic compounds
The title compound, C30H50O3, a lupane triterpene, was isolated from the leaves of Ceriops decandra (Griff.) Ding Hou. There are two crystallographically independent molecules in the asymmetric unit. In both molecules, the cyclopentane ring adopts an envelope conformation. In the crystal structure, molecules are interconnected into a two-dimensional network by intermolecular O—HO hydrogen bonds.
O hydrogen bonds.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, 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, C8H15NO7, the methyl carbamate of β-D-glucosamine has been synthesized, in moderate yield, from the reaction of β-D-glucosamine hydrochloride and methyl chloroformate. There are two crystallographically independent molecules in the asymmetric unit. In both molecules, the pyranose ring adopts a slightly distorted chair conformation. In the crystal structure, molecules are packed along the a axis, with intra- and intermolecular O—HO, N—HO and C—HO hydrogen bonds.
O, N—HO and C—HO hydrogen bonds.organic compounds
The title compound, 2-hydroxy-2-(4-hydroxyphenyl)-N-methylethanaminium chloride, C9H14NO2+·Cl−, has been isolated for the first time from the genus Harrisonia. Its structure is stabilized by extensive intra- and intermolecular hydrogen bonds of type O—HO, N—HO, N—HCl and C—HCl, resulting in a three-dimensional network. Additional weak π–π stacking interactions between adjacent molecules further stabilize the crystal structure.
O, N—HO, N—HCl and C—HCl, resulting in a three-dimensional network. Additional weak π–π stacking interactions between adjacent molecules further stabilize the crystal structure.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
The title compound, C16H16N2O2, was synthesized by the condensation of aniline and succinic anhydride. The molecule lies across a crystallographic inversion centre. The dihedral angle between the benzene and acetamide planes is 33.36 (7)°. N—HO hydrogen bonds link the molecules into chains along [010].
O hydrogen bonds link the molecules into chains along [010].organic compounds
The title compound, C20H32O4, was isolated from Pulicaria unduleta. It has an ent-kaurane diterpeniod ring system. In the crystal structure, the molecules are linked via O—HO hydrogen bonds into a ribbon structure.
O hydrogen bonds into a ribbon structure.organic compounds
The title compound, C12H13NO5, was synthesized by the condensation of methyl anthranilate and succinic anhydride. The dihedral angle between the phenylacetamide and carboxylic acid (–C—COOH) planes is 80.47 (5)°. In the crystal structure, inversion-related molecules form an O—HO hydrogen-bonded dimer. Adjacent dimers are interlinked by C—HO hydrogen bonds to form a chain along [110].
O hydrogen-bonded dimer. Adjacent dimers are interlinked by C—HO hydrogen bonds to form a chain along [110].organic compounds
The title compound, C28H27O10Cl·CH3OH·H2O, was isolated from Physalis minima. The rigid molecule consists of eight fused rings involving three lactones. The spiro-fused γ-lactone rings are in half-chair and envelope conformations. The spiro-fused γ-lactone rings are fused to a cyclohexene ring, which is in a half-chair conformation. The outermost cyclohexene ring and δ-lactone rings adopt half-chair and envelope conformations, respectively. Intra- and intermolecular O—HO, C—HCl and C—HO hydrogen bonds are observed.
O, C—HCl and C—HO hydrogen bonds are observed.organic compounds
In the title compound, C35H42O4, the chromene ring is in a distorted half-chair conformation and the cyclohexadienone ring adopts a screw-boat conformation. Intramolecular O—HO hydrogen bonds involving the carbonyl and hydroxyl groups are observed.
O hydrogen bonds involving the carbonyl and hydroxyl groups are observed.organic compounds
The title compound, C13H10O5, is a benzophenone derivative containing phloroglucinol and p-hydroxybenzoyl groups. The p-hydroxybenzoyl group is twisted out of the plane of the phloroglucinol group as a result of steric hindrance [dihedral angle = 50.2 (1)°]. In the crystal packing, screw-related molecules are linked by O—HO hydrogen bonds to form a zigzag layer parallel to (10
). Adjacent layers are interlinked by O—HO hydrogen bonds involving the solvent water molecules.
O hydrogen bonds to form a zigzag layer parallel to (10
). Adjacent layers are interlinked by O—HO hydrogen bonds involving the solvent water molecules.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, 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.organic compounds
The title compound, C23H24O6, a xanthone derivative, was isolated from Garcinia polyantha Oliver. The orientation of the 3,7-dimethylocta-2,6-dienyl substituent with respect to the xanthone ring system is (+)synclinal. The crystal packing is stabilized by O—HO and C—HO intermolecular hydrogen bonds and π–π interactions.
O and C—HO intermolecular hydrogen bonds and π–π interactions.
