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The title compound [systematic name: (2S)-1-(2-hydroxy-1-naphthyl­meth­yl)pyrrolidinio-2-carboxyl­ate], C16H17NO3, a derivative of L-proline, was synthesized via the Mannich reaction. The X-ray crystal analysis reveals that the pyrrolidine ring adopts an envelope conformation, with the flap C atom deviating by 0.631 (9) Å from the plane defined by the other four atoms.

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The formation of the title compound, (S)-2-ammonio-1-butanol (2R,3R)-tartrate, C4H12NO+·C4H5O6-, the (S)-2-amino-1-butanol mol­ecule is converted to a cationic form containing a positively charged amino group, and the tartaric acid mol­ecule to a mono- or half-ionized tartrate anion. The structure is stabilized by a three-dimensional network of hydrogen bonds.

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In the title compound, C22H19NO, the Csp2 atom of the benzimido group reveals a distorted trigonal geometry, which results in the approximately overall trigonal shape of the mol­ecule.

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The crystal structure of the title compound, [Cu(C5H5N)2{Cu(CN)4}]n, comprises [Cu(py)2]2+ (py is pyridine) and [Cu(CN)4]2− subunits which are connected through bridging cyano groups to form a three-dimensional network, with Cu atoms located on sites of symmetry 2/m and 222 for the cation and anion, respectively.

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In the title structure, C14H10O5, the angle between the planes formed by the 2,4-di­hydroxy­benzoyl and o-benzoic acid moieties is 87.12 (4)°. In addition to an intramolecular O—H...O hydrogen bond, intermolecular O—H...O hydrogen bonds (H...O = 1.76 and 1.89 Å) connect mol­ecules to form a two-dimensional network parallel to (10\overline 1).

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The title compound, C24H18, possesses a twofold rotation axis, which bisects the 1,2-di­methyl­benzene ring. In the crystal structure, all three benzene rings are essentially coplanar, the angle between the central and terminal rings being 3.8 (1)°.

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In the title compound, C16H15N3O2, the dihedral angle between the benzotriazole moiety and the other benzene ring is 74.40 (7)°. The short distance [3.488 (3) Å] between the centroids of benzene rings of neighbouring mol­ecules may indicate a π–π interaction, forming centrosymmetric dimers. The packing is further stabilized by van der Waals forces.

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The title compound, C21H24N2O3, is a zwitterion of the Cinchona alkaloid complex. In the crystal structure, intermolecular O—H...O and C—H...O hydrogen bonds link the mol­ecules into one-dimensional double-stranded ladders. The crystal packing is further stabilized by van der Waals forces.

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In the title compound, C13H9N3O2, the dihedral angle between the benzimidazole moiety and the benzene ring is 40.08 (6)°. The mol­ecules are linked into chains along the b axis by inter­molecular N—H...N hydrogen bonds. The chains are inter­linked into a two-dimensional network by C—H...O hydrogen bonds.

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In the title compound, C11H10N4O3, the substituted phen­yl ring and the triazole ring make a dihedral angle of 59.7 (2)°. The mol­ecules are linked into zigzag chains by inter­molecular C—H...O hydrogen bonds. These chains are further connected through C—H...N hydrogen bonds to build up a three-dimensional network.

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The title compound, C22H18FNO3, was synthesized by the reaction of 1-naphthol with eth­yl cyano­caetate and 3-fluoro­benzaldehyde in ethanol under microwave irradiation. In the crystal structure, there are intra­molecular N—H...O hydrogen bonds and inter­molecular N—H...O and N—H...F hydrogen bonds. An intra­molecular C—H...π inter­action is also present.

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In the title compound, C15H14ClF3N2O2, the benzene and pyrazol­yl rings form a dihedral angle of 15.9 (3)°.

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The title compound, C15H15N3S, was prepared by the reaction of acetophenone and hydrazine with phenyl­isothio­cyanate. In the mol­ecule, all bond lengths and angles are within normal ranges. The two phen­yl rings make a dihedral angle of 61.6 (2)°. The crystal packing is stabilized by van der Waals forces.

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The title compound, C13H14ClN5O, was synthesized from 2,4-dichloro-6-morpholino-1,3,5-triazine and aniline. In the crystal structure, there are inter­molecular N—H...O hydrogen bonds which propagate infinite chains parallel to the c axis. The morpholine ring adopts a chair conformation.

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In the title mol­ecule, C21H15NO, the two ethyn­yl-bridged six-membered rings are almost coplanar, making a dihedral angle of 3.3 (2)°. The dihedral angle between the two terminal phen­yl rings is 62.9 (2)°. The crystal packing is stabilized by weak inter­molecular N—H...O hydrogen bonds.

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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, C15H12N2O3, is non-planar, with a dihedral angle of 83.0 (1)° between the two benzene rings. The mol­ecules are linked into a ribbon along the b axis by inter­molecular C—H...O and O—H...N hydrogen bonds. The packing is further stabilized by C—H...π and π–π inter­actions.

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The title compound, C16H14N2O2, is non-planar, with a dihedral angle of 13.97 (8)° between the two benzene rings. There exists an intra­molecular C—H...O hydrogen bond, forming a six-membered ring.
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