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In the title compound, C20H21NO4, the two benzene rings are almost perpendicular to each other, making a dihedral angle of 86.1 (7)°. The hy­droxy­ethanimine group is essentially coplanar with the benzene ring, the largest deviation from the mean plane of the hy­droxy­ethanimine [C=N—OH] group being 0.011 (1) Å for the O atom. An intra­molecular C—H⋯O hydrogen bond occurs. The mol­ecules are linked into cyclic centrosymmetric R 2 2(6) dimers via O—H⋯N hydrogen bonds. Inter­molecular C—H⋯O hydrogen bonds link the mol­ecules, forming a C(8) chain along the a axis. The crystal packing is further stabilized by C—H⋯π inter­actions.

In the title compound, C18H16ClNO4, the dihedral angle between the mean planes through the aromatic rings is 83.8 (8)°. The hy­droxy­ethanimine group is essentially coplanar with the ring to which it is attached [O—N—C—C torsion angle = −177.96 (13)°]. The mol­ecules are linked into centrosymmetric R 2 2(6) dimers via O—H⋯N hydrogen bonds. The crystal packing is further stabilized by C—H⋯O inter­actions.

In the title compound, C20H21NO5, the dihedral angle between the mean planes through the two rings is 47.1 (8)°. The enoate group assumes an extended conformation. The hy­droxy­ethanimine group is essentially coplanar with the benzene ring, the largest deviation from the mean plane being 0.061 (1) Å for the O atom. In the crystal, mol­ecules are linked into cyclic centrosymmetric dimers with an R 2 2(6) motif via pairs of O—H⋯N hydrogen bonds. Inter­molecular C—H⋯O hydrogen bonds form a C(8) chain along the b axis. The crystal packing is further stabilized by C—H⋯π inter­actions.

In the title compound, C18H16N2O2, the dihedral angle between the mean planes through the two benzene rings is 56.8 (6)°. The enoate group assumes an extended conformation. The hy­droxy­ethanimine group is essentially coplanar with the benzene ring, the largest deviation from the mean plane being 0.047 (1) Å for the hy­droxy­imino O atom. In the crystal, the mol­ecules are linked into cyclic centrosymmetric dimers with R 2 2(6) motifs via O—H⋯N hydrogen bonds.

In the title compound, C18H17NO4, the hy­droxy­ethanimine group is essentially coplanar with the ring to which it is attached [C—C—N—O torsion angle = 179.94 (14)°]. The mol­ecules are linked into cyclic centrosymmetric R 2 2(6) dimers via O—H⋯N hydrogen bonds and the crystal packing is further stabilized by C—H⋯O inter­actions.

In the title compound, C18H16N2O2, the hy­droxy­ethanimine group is essentially coplanar with the ring to which it is attached (C—C—N—O torsion angle = −176.9°). Mol­ecules are linked into cyclic centrosymmetric R 2 2(6) dimers via O—H⋯N hydrogen bonds.

In the title compound, C19H16O3, an intra­molecular O—H⋯O=C hydrogen bond is formed between the hy­droxy and carbonyl groups on the naphthalene ring system, resulting in an S(6) ring. The angles between the C=O bond vector and the least-squares planes of the naphthalene ring system and the benzene ring are 27.63 (6) and 47.99 (7)°, respectively. The dihedral angle between the latter planes is 61.39 (5)°. In the crystal, two mol­ecules are connected by pairs of inter­molecular O—H⋯O=C hydrogen bonds, forming centrosymmetric dimers with an R 2 2(4) graph-set motif. The mol­ecular packing features C—H⋯π interactions.

In the title compound, C14H11BrN2O2, the mean planes of the two benzene rings are almost parallel to each other, making a dihedral angle of 4.09 (1)°. An intra­molecular O—H⋯N hydrogen bond occurs. In the crystal, inter­molecular O—H⋯N and C—H⋯O hydrogen bonds link the mol­ecules into a chain-like supra­molecular structure.

The title compound, C19H19ClO5, is a chloro derivative of a biologically significant chalcone family. The mean plane of the two substituted benzene rings are twisted by 55.33 (8)° with respect to each other. An intra­molecular C—H⋯Cl hydrogen bond generates an S(5) graph-set motif. In the crystal, a bifurcated O—H⋯(O,O) hydrogen bond leads to an R 1 2(5) graph-set motif and to the formation of zigzag chains propagating along the c-axis direction. A weak π–π inter­action involving the methyl­phenyl rings [centroid–centroid distance = 3.8185 (10) Å] and C—H⋯π inter­actions also occur.

In the title compound, C21H23N5O2, the conformation about the imine bond [1.287 (3) Å] is E. Overall, the mol­ecule has a disk shape, the dihedral angles between the imidazole ring and the meth­oxy­phenyl and methyl­phenyl rings being 49.42 (13) and 42.62 (13)°, respectively; the dihedral angle between the benzene rings is 20.11 (11)°. In the urea moiety, the N—H atoms are anti to each other and one of these forms an intra­molecular N—H⋯N hydrogen bond. In the crystal, centrosymmetric dimers are formed via N—H⋯N(imidazole) hydrogen bonds, which are connected into a three-dimensional architecture by C—H⋯O(carbon­yl) and (methyl­ene)C—H⋯π inter­actions. The crystal studied was a non-merohedral twin with a minor component of 48.3 (1)%.

In the title compound, C17H14N2O2, the hy­droxy­ethanimine group adopts an anti­periplanar conformation. In the crystal, mol­ecules are linked by O—H⋯N hydrogen bonds, forming zigzag chains running along the c axis.

Mol­ecules of the title compound, C23H30N2O4, are located on a crystallographic mirror plane. The mol­ecule has a curved shape with the dihedral angle formed between the two benzene rings being 55.26 (5)°. Intra­molecular O—H⋯N hydrogen bonds are noted. In the crystal, supra­molecular layers are formed in the ac plane owing to the presence of C—H⋯π inter­actions.

The title compound, C15H13ClN2O2, adopts an E conformation with respect to the azomethine C=N bond. The aniline and phenol rings are almost coplanar, making a dihedral angle of 3.33 (2)°. In the crystal, the mol­ecules lie about inversion centers, forming dimers that are connected by inter­molecular O—H⋯N hydrogen bonds, resulting in six-membered rings with graph-set motif R 2 2(6). In addition, there is a strong inter­molecular O—H⋯N hydrogen-bonding inter­action, resulting in an S(6) ring motif. Weak π–π inter­actions between the benzene rings [centroid–centroid distance = 3.809 (1) Å] further stabilize the crystal structure.

The title compound, C17H15ClN2O5, displays a trans-configuration with respect to the C=N double bond. The mol­ecule is twisted, the dihedral angle between the mean planes of the two benzene rings being 18.70 (12)°. The nitro, meth­oxy and acetyl groups are oriented at 80.70 (11), 35.2 (2) and 72.35 (10)°, respectively, to the benzene ring to which they are bonded. The crystal structure is stabilized by weak C—H⋯O hydrogen-bonding contacts.

Mol­ecules of the title compound, C34H38N4O2, lie across crystallographic inversion centres. The crystal packing can be described by alternating zigzag chains along the c axis in which the molecules are linked by van der Waals interactions. There is an intra­molecular O—H⋯N hydrogen bond and the two benzene rings in the asymmetric unit make a dihedral angle of 79.81 (6)°.

In the title compound, C17H16O3, the dihedral angle between the aromatic rings is 4.59 (7)° and an intra­molecular O—H⋯O hydrogen bond generates an S(6) ring. In the crystal, adjacent mol­ecules are linked by C—H⋯O hydrogen bonds, leading to the formation of [001] supra­molecular chains. Weak C—H⋯π inter­actions consolidate the packing.

In the title compound, C15H12BrClN2O4, the configuration of the C=N double bond can be described as trans. The two aromatic rings in this Schiff base are nearly coplanar with a dihedral angle between their mean planes of 15.4 (2)°. In the crystal, molecules are linked via O—H⋯N and C—H⋯O interactions.

In the title compound, C14H16N6O6·C2H6O·H2O, both substit­uents of the benzene ring are approximately planar with maximum deviations from the mean plane of 0.0561 (12) (an imine N atom) and 0.1419 (11) Å (a meth­oxy O atom). The substituents are tilted out of the plane of the benzene ring by 64.48 (4) and 70.08 (5)°, respectively. In the crystal, mol­ecules form centrosymmetric dimers associated via pairs of N—H⋯O hydrogen bonds. The dimers are linked via the water and ethanol mol­ecules, forming two-dimensional hydrogen-bond networks lying parallel to (100).

In the mol­ecule of the title compound, C31H36N2O5, the piperazine ring displays a chair conformation. The dihedral angle between the benzene rings of the bis­(4-meth­oxy­phen­yl)methyl group is 83.42 (15)°. In the crystal, centrosymmetric­ally related mol­ecules are linked through pairs of C—H⋯O hydrogen bonds into dimers, generating an R 2 2(10) ring motif. The dimers are further connected into chains parallel to [2-10] by C—H⋯O hydrogen bonds involving the meth­oxy groups.

In the title compound, C17H17NO4, the dihedral angle between the two aromatic rings is 59.64 (5)°. The (meth­oxy­imino)­ethanoic acid fragment is nearly perpendicular to the attached benzene ring [dihedral angle = 81.07 (4)°]. In the crystal, pairs of O—H⋯O hydrogen bonds between carb­oxy groups link mol­ecules into inversion dimers. In addition, π–π stacking inter­actions between inversion-related benzene rings are observed [centroid–centroid distance = 3.702 (1) Å].

In the title compound, C24H29BrO6, the dihedral angle between the cyclo­hexenone mean planes is 57.63 (2)° while the dihedral angles between the benzene ring and the cyclo­hexenone mean planes are 58.42 (2) and 69.08 (3)°. The two cyclo­hexenone rings both show an envelope conformation, with the C atom bearing two methyl groups as the flap atom in each ring. Two intra­molecular O—H⋯O hydrogen bonds occur. In the crystal, molecules are linked via pairs of O—H⋯O hydrogen bonds, forming inversion dimers.

In the title compound, C18H13Cl2N3OS, the eight atoms comprising the central imidazo/thia­diazo­lethia­diazole residue are coplanar (r.m.s. deviation = 0.009 Å). The dihedral angle of 8.72 (13)° between the dichloro­benzene and tolyl rings reflects a twist about the O—C(benzene) bond; the Cm—O—Cb—Cb torsion angle = −168.5 (2)° (m = methyl­ene C and b is benzene C). Supra­molecular tapes along the b axis are found in the crystal structure which are mediated by π–π inter­actions occurring between centrosymmetrically related thia­diazole rings [inter-ring centroid distance = 3.6907 (16) Å] and between the benzene and tolyl rings [inter-ring centroid distance = 3.7597 (16) Å].

The title compound, 2C21H19N3O2·H2O, was synthesized by a Schiff base condensation of 2,6-diformyl­pyridine with 2-amino-4-methyl­phenol in ethanol. In the crystal, two mol­ecules of 2,6-bis­[(2-hy­droxy-5-methyl­phen­yl)imino­meth­yl]pyridine dimer­ize via hydrogen bonding to a water mol­ecule, which lies on a twofold axis. There are also intra­molecular phenol–imine hydrogen bonds. The dimers are further linked via π–π (phen­yl–pyridine) [centroid–centroid distance = 3.707 (2) Å] and π–π edge-to-edge [3.392 (2) Å] inter­actions. The dihedral angles between the central ring and the two pendant rings are 11.46 (8) and 2.06 (8)° while the pendant rings make a dihedral angle of 10.14 (8)°.

The title compound, C24H27FN2O4, is an important inter­mediate in the synthesis of fungicidal strobilurin-type compounds. In the crystal structure, the oxime bond attached to the cyclo­propane ring adopts a Z configuration, while the oxime bond attached to the benzene ring adopts an E configuration. The fluoro­methyl­phenyl group adopts a trans configuration with respect to the remainder of the mol­ecule, and its mean plane forms a dihedral angle of 56.1 (1)° with the plane of the cyclo­propane ring.

In the mol­ecule of the title compound, C23H17N3O2, the methoxy­phenyl ring is oriented at dihedral angles of 13.34 (12) and 88.83 (12)° with respect to the methyl­phenyl and phthalonitrile rings, respectively; the dihedral angle between methyl­phenyl and phthalonitrile rings is 89.67 (10)°. In the crystal structure, weak inter­molecular C—H⋯N inter­actions link mol­ecules into chains. A weak C—H⋯π inter­action is also found..