Crystal structure of 4-(3-fluorophenyl)-7-hydroxy-2H-chromen-2-one, C15H9FO3

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Crystal structure of 7-[(2E)-2-benzyl­idene-3-oxobut­oxy]-4-methyl-2H-chromen-2-one

Two independent mol-ecules (A and B) comprise the asymmetric unit of the title compound, C21H18O4. There are significant conformational differences between the mol-ecules relating in particular to the relative orientation of the 3-oxo-2-(phenyl-methyl-idene)but-oxy substituent with respect to the superimposable chromen-2-one residues. To a first approximation, the substituents are mirror images...

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The coumarin ring system in the title asymmetric alkyne, C18H12O2, is approximately planar (r.m.s. deviation of the 11 non-H atoms = 0.048 Å), and is inclined with respect to the methyl-benzene ring, forming a dihedral angle of 33.68 (4)°. In the crystal, supra-molecular zigzag chains along the c-axis direction are formed via weak C-H⋯O hydrogen bonds, and these are connected into double layers...

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Crystal structure of 2-(4-tert-butyl­phen­yl)-3-hydroxy-4H-chromen-4-one

Yellow-green fluorescent crystals of the title compound, C19H18O3, were obtained by the reaction of hy-droxy-aceto-phenone and 4-tert-butyl-benzaldehyde with hydrogen peroxide as oxidant. The plane of the benzene ring is slightly twisted to the mean plane of the 4H-chromene-4-one moiety (r.m.s. deviation = 0.0191 Å) by 10.53 (8)°. In the crystal, mol-ecules are linked by pairs of O-H⋯O hydrogen...

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Crystal structure of 4-methyl-7-prop­oxy-2H-chromen-2-one

The asymmetric unit of the title compound, C13H14O3, contains two independent mol-ecules, A and B, that are inter-connected through an offset π-π inter-action [inter-centroid separation = 3.6087 (4) Å]. The fused benzene and pyran-2-one rings in each mol-ecule are essentially coplanar, having dihedral angles of 1.22 (12) and 1.57 (12)° for mol-ecules A and B, respectively. Similarly, the coumar...

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Crystal structure of 7-hy­droxy-8-[(4-methyl­piperazin-1-yl)meth­yl]-2H-chromen-2-one

In the title compound, C15H18N2O3, the coumarin ring is essentially planar, with an r.m.s. deviation of 0.012 Å. An intra-molecular O-H⋯N hydrogen bond forms an S(6) ring motif. The piperazine ring adopts a chair conformation. In the crystal, a C-H⋯O hydrogen bond generates a C(4) chain motif running along the c axis. The chain structure is stabilized by a C-H⋯π inter-action. The chains are lin...

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ژورنال

عنوان ژورنال: Zeitschrift für Kristallographie - New Crystal Structures

سال: 2020

ISSN: 2197-4578,1433-7266

DOI: 10.1515/ncrs-2019-0869