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33 citations found for Zeng, Z
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In the title fluorinated pyrrolidine derivative, C10H10F4N2, the dihedral angle between the best planes of the benzene and pyrrolidine rings is 62.6 (1)°. The crystal packing features intermolecular N—H
F hydrogen bonds.
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The title compound, C16H17O5P, was obtained by the reaction of benzoyl chloride and dimethyl (hydroxyphenylmethyl)phosphonate. The molecular packing is stabilized by van der Waals forces.
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The title compound, C9H13O4P, has been obtained by the reaction of dimethyl phosphite and benzaldehyde. In the crystal structure, intermolecular O—H
O hydrogen bonds link the molecules into infinite chains.
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The title compound, C19H17O4P, was obtained as colorless block-shaped crystals by the reaction of diphenyl phosphite and benzaldehyde. The crystal structure is stabilized by strong intermolecular O—H
O hydrogen bonds.
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PAP-S, a ribosome-inactivating protein with three N-glycosylation sites, was crystallized under high protein concentration (100 mg ml-1) and high temperature (306 K). The crystals, diffracting to 1.8 Å, provide a chance to reveal the accurate structure of functionally significant glucosamine groups bound to the protein.
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The title compound, C20H22ClNO3, was synthesized by the reaction of 3-chlorobenzaldehyde, 5,5-dimethyl-1,3-cyclohexanedione and methyl 2-aminocrotonate in an ionic liquid medium. The X-ray analysis reveals that the nitrogen-containing ring adopts a boat conformation and the cyclohexene ring has a half-chair conformation. Intermolecular N—H
O bonds in the structure lead to the formation of chains.
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The title compound, C16H16N2O3, was synthesized by the reaction of phenylmethylidenemalononitrile and ethyl acetoacetate in the presence of triethylbenzylammonium chloride in an aqueous medium. The pyran ring adopts a boat conformation. The phenyl ring and the basal plane of the pyran ring make a dihedral angle of 94.5 (2)°. Intermolecular N—H
O and N—H
N hydrogen bonds link the molecules into ribbons along the a axis.
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The title complex, [Pr2(C4H2O4)3(C4H4O4)(H2O)2]n, was synthesized by reaction of praseodymium(III) nitrate hexahydrate with fumaric acid in a water–ethanol (4:1) solution. The asymmetric unit comprises a Pr3+ cation, one and a half fumarate dianions (L2−), one half-molecule of fumaric acid (H2L) and one coordinated water molecule. The carboxylate groups of the fumarate dianion and fumaric acid exhibit different coordination modes. In one fumarate dianion, two carboxylate groups are chelating with two Pr3+ cations, and the other two O atoms each coordinate a Pr3+ cation. Each O atom of the second fumarate dianion binds to a different Pr3+ cation. The fumaric acid employs one O atom at each end to bridge two Pr3+ cations. The Pr3+ cation is coordinated in a distorted tricapped trigonal–prismatic environment by eight O atoms of fumarate dianion or fumaric acid ligands and one water O atom. The PrO9 coordination polyhedra are edge-shared through one carboxylate O atom and two carboxylate groups, generating infinite praseodymium–oxygen chains, which are further connected by the ligands into a three-dimensional framework. The crystal structure is stabilized by O—H
O hydrogen-bond interactions between the coordinated water molecule and the carboxylate O atoms.
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The title compound, C20H17NO5, was prepared by the reaction of 3-acetyl-2-oxo-2H-chromen-7-yl acetate with benzyloxyamine. The molecule adopts an E configuration with respect to the C=N double bond. The dihedral angles between the coumarin ring system, the phenyl ring and the C=N—O—C plane of the oxime unit are 35.83 (6), 35.8 (2) and 69.99 (15)°, respectively. In the crystal, a two-dimensional supramolecular network is assembled through weak intermolecular C—H
O hydrogen-bonding interactions.
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The asymmetric unit of the title compound, C14H12F8N2, contains one tetrafluoropyrrolidine system and one half-molecule of benzene; the latter, together with a second heterocyclic unit, are completed by symmetry, with a twofold crystallographic axis crossing through both the middle of the bond between the C atoms bearing the heterocyclic rings and the opposite C—C bonds of the whole benzene molecule. The pyrrolidine ring shows an envelope conformation with the apex at the N atom. The dihedral angle between the least-squares plane of this ring and the benzene ring is 36.9 (5)°. There are intramolecular C—H
N interactions generating S(6) ring motifs. In the crystal structure, the molecules are linked by C—H
F interactions, forming chains parallel to [010].
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The structure of the title compound, C13H10O4, which was synthesized by the reaction of salicylaldehyde and 4-hydroxy-6-methyl-2H-pyran-2-one in the presence of triethylbenzylammonium chloride in aqueous media, was previously determined at room temperature [March, Moreno-Manas, Roca, Germain, Piniella & Dideberg (1986). J. Heterocycl. Chem. 23, 1511–1153]. As in the present determination, the X-ray analysis revealed that the title compound is in the enol form, which was confirmed by 1H NMR data. Weak intermolecular C—H
O interactions connect molecules into a two-dimensional framework.
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The title compound, C19H12N3O2·C3H7NO, was synthesized by the reaction of 1-(4-chlorophenyl)-3-phenylprop-2-en-1-one and 6-aminouracil in the presence of KF–alumina in ethyl alcohol; its crystal structure was determined at low temperature [193 (2) K]. The crystal structure is stabilized by N—H
O, C—H
O and C—H
Cl hydrogen bonds.
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The title compound, C20H15N3O6·C3H7NO, was synthesized by the reaction of methyl 2-cyano-3-(3-nitrophenyl)acrylate and 4-hydroxyquinolin-2-one in ethanol, catalysed by KF-alumina. X-ray analysis reveals that the pyran ring adopts a boat conformation.
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The title compound, C20H15N3O6·C3H7NO, was synthesized by the reaction of methyl cyanoacetate, 4-nitrobenzaldehyde and 4-hydroxyquinolin-2-one in EtOH catalysed by KF-alumina, followed by crystallization from dimethylformamide. X-ray analysis reveals that the pyran ring adopts a boat conformation.
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The title compound, C24H25N3O5, was synthesized by the reaction of methyl 2-cyano-3-(4-methylphenyl)-1-acrylate and 4-hydroxyquinolin-2-one in the presence of triethylbenzylammonium chloride in aqueous media. X-ray analysis reveals that the pyran ring adopts a boat conformation.