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In the hexacoordinated title germanium compound [alternatively called (butanoato-κ2C3,O)bis(8-quinolato-κ2N,O)germanium(IV)], [Ge(C9H7NO)2(C4H6O2)], the Ge atom adopts a slightly distorted octahedral geometry, where the Ge—N coordinate covalent bonds [mean 2.079 (8) Å] are significantly longer than the Ge—O [mean 1.904 (8) Å] and Ge—C [1.976 (3) Å] covalent bonds.

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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—H...O hydrogen bonds which generate rings of motif R22(10). The crystal structure is further stabilized by weak π–π interactions.

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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.

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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—H...O and C—H...O hydrogen bonds.

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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—H...O hydrogen bonds.

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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—H...O, N—H...O and C—H...O hydrogen bonds.

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The title compound, [Sn(CH3)3(C8H5Cl2O2)]n, forms polymeric chains involving both O atoms of the carboxyl­ate group. The coordination geometry of the Sn atom is slightly distorted trigonal bipyramidal. The three methyl groups occupy the equatorial positions, with Sn—C bond lengths in the range 2.103 (8)–2.118 (7) Å. The two O atoms are situated in the axial positions, with Sn—O distances of 2.189 (4) Å and 2.369 (5) Å.

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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—H...O hydrogen bonds link the mol­ecules into chains along [010].

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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—H...O hydrogen bonds into a ribbon structure.

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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—H...O hydrogen-bonded dimer. Adjacent dimers are inter­linked by C—H...O hydrogen bonds to form a chain along [110].

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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—H...O, C—H...Cl and C—H...O hydrogen bonds are observed.

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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—H...O hydrogen bonds involving the carbonyl and hydroxyl groups are observed.

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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—H...O hydrogen bond. Glide-related mol­ecules are linked by C—H...O hydrogen bonds to form a chain along the c axis. The chains are arranged to form a layered structure parallel to the bc plane.

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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—H...O and C—H...O inter­molecular hydrogen bonds and π–π inter­actions.
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