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In the title compound, C17H13Cl2NO2, the H atom of the –OH group is transferred to the N atom of the imine, forming a zwitterion. Thus, there is a intramolecular O
H—N, rather than O—HN, hydrogen bond, which forms a six-membered ring.
H—N, rather than O—HN, hydrogen bond, which forms a six-membered ring.organic compoundsOpen access
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In the title compound, C21H15Cl2NO2, the H atom of the –OH group is transferred to the N atom of the imine, forming a zwitterion. Thus, there is formation of a six-membered ring via an intramolecular OH—N, rather than O—HN, hydrogen bond in the molecule. The dihedral angle between the naphthalene ring system and the benzene ring of the 2H-chromen system is 87.41 (4)°. In the crystal, the molecules are packed through N—HO, π–π [centroid–centroid distances = 3.744 (3) and 3.780 (3) Å], C—Clπ [Clcentroid = 3.261 (3) Å], C—Hπ and C—HO interactions.
H—N, rather than O—HN, hydrogen bond in the molecule. The dihedral angle between the naphthalene ring system and the benzene ring of the 2H-chromen system is 87.41 (4)°. In the crystal, the molecules are packed through N—HO, π–π [centroid–centroid distances = 3.744 (3) and 3.780 (3) Å], C—Clπ [Clcentroid = 3.261 (3) Å], C—Hπ and C—HO interactions.organic compoundsOpen access
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The 1,3-diketone group of the title compound, C21H20O6, exists in a keto–enol form stabilized by a strong intramolecular O—HO hydrogen bond. As a result, a planar (mean deviation = 0.0099 Å) six-membered hydrogen-bonded ring is formed. The C—O and C—C bond lengths suggest significant electron delocalization in the ring. The dihedral angle between the six-membered hydrogen-bonded ring and its adjacent benzene ring is 8.78 (5)° and that between the benzene rings is 19.70 (5)°. In the crystal, molecules are packed in a layered structure parallel to the b axis through C—HO and π–π interactions [centroid–centroid distance between stacked benzene rings = 3.868 (2) Å].
O hydrogen bond. As a result, a planar (mean deviation = 0.0099 Å) six-membered hydrogen-bonded ring is formed. The C—O and C—C bond lengths suggest significant electron delocalization in the ring. The dihedral angle between the six-membered hydrogen-bonded ring and its adjacent benzene ring is 8.78 (5)° and that between the benzene rings is 19.70 (5)°. In the crystal, molecules are packed in a layered structure parallel to the b axis through C—HO and π–π interactions [centroid–centroid distance between stacked benzene rings = 3.868 (2) Å].organic compoundsOpen access
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The title compound, C16H13NO3, exists in the keto form and the isoquinoline system is essentially planar (mean deviation = 0.0424 Å). The dihedral angle between the aromatic rings is 4.2 (2)°. In the crystal, molecules are linked via weak C—HO hydrogen bonds and C—Hπ interactions, forming a three-dimensional structure.
O hydrogen bonds and C—Hπ interactions, forming a three-dimensional structure.organic compoundsOpen access
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The title molecule, C9H7NO3, exists in the diketo form and the isoquinoline unit is approximately planar (r.m.s. deviation = 0.0158 Å). In the crystal, molecules are linked into inversion dimers through pairs of O—HO hydrogen bonds and are further assembled into the (100) layers via stacking interactions [centroid–centroid distances = 3.460 (3) and 3.635 (4) Å].
O hydrogen bonds and are further assembled into the (100) layers via stacking interactions [centroid–centroid distances = 3.460 (3) and 3.635 (4) Å].organic compoundsOpen access
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The asymmetric unit of the title compound, C10H4Cl2O3, contain two essentially planar independent molecules (mean atomic deviations from the corresponding least-square planes are 0.041 and 0.045 Å for molecules 1 and 2, respectively). In the crystal, molecules are linked through a pair of halogen bonds [ClO separations are 3.044 (5) and 3.033 (6) Å, C—ClO angles are 160.4 (3) and 162.8 (3)°, and C=OCl angles are 138.7 (4) and 139.6 (4)°, respectively, in molecules 1 and 2] and C—HO hydrogen bonds into slightly folded bands [the dihedral angle between the planes of neighboring molecules is 8.6 (2)°] along the c-axis direction.
O separations are 3.044 (5) and 3.033 (6) Å, C—ClO angles are 160.4 (3) and 162.8 (3)°, and C=OCl angles are 138.7 (4) and 139.6 (4)°, respectively, in molecules 1 and 2] and C—HO hydrogen bonds into slightly folded bands [the dihedral angle between the planes of neighboring molecules is 8.6 (2)°] along the c-axis direction.organic compoundsOpen access
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In the crystal of the title compound, C23H17Cl2NO2, the H atom of the –OH group is transferred to the N atom of the imine, forming a zwitterion. This results in a six-membered intramolecular OH—N hydrogen-bonded ring, rather than that formed with an O—HN hydrogen bond. The dihedral angle between the rings of the biphenyl unit is 13.88 (10)°. In the crystal, molecules are linked by N—HO and C—HO interactions.
H—N hydrogen-bonded ring, rather than that formed with an O—HN hydrogen bond. The dihedral angle between the rings of the biphenyl unit is 13.88 (10)°. In the crystal, molecules are linked by N—HO and C—HO interactions.organic compoundsOpen access
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In the title m-terphenyl derivative, C22H17NO4, the dihedral angles between the aromatic rings of the benzoic acid–acetophenone, acetophenone–benzamide and benzoic acid–benzamide units are 45.39 (8), 48.02 (8) and 42.93 (8)°, respectively. The carbamoyl and carboxyl groups are disordered with a refined occupancy ratio of 0.558 (15):0.442 (15). In the crystal, molecules are linked through O—HO and N—HO hydrogen bonds between terminal carboxyl and carbamoyl groups in a bidentate manner, and antiparallel helices are formed which extend along the b-axis direction.
O and N—HO hydrogen bonds between terminal carboxyl and carbamoyl groups in a bidentate manner, and antiparallel helices are formed which extend along the b-axis direction.
