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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, 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, 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, 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, C19H19NO4, the dihedral angle between the mean planes through the benzene rings is 82.18 (7)°. The C=N double bond is trans-configured. The mol­ecules are linked into centrosymmetric dimers via pairs of O—H⋯N hydrogen bonds with the motif R 2 2(6). The crystal packing also features C—H⋯O inter­actions. The methyl group attached to one of the aromatic rings is disordered over two almost equally occupied positions [occpancy ratio = 0.51 (4):0.49 (4)].

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.

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 benzophenone compound, C14H12O6·H2O, was isolated from the bark of Garcinia hombroniana Pierre (Guttiferae). The mol­ecule is twisted, the dihedral angle between the two benzene rings being 59.13 (7)°. The meth­oxy group is approximately coplanar with the attached benzene ring, with a C—O—C—C torsion angle of 1.91 (18)°. The water mol­ecule is disordered over two positions in a 0.555 (19):0.445 (19) ratio. An intra­molecular O—H⋯O hydrogen bond generates an S(6) ring motif. The crystal structure is stabilized by inter­molecular O—H⋯O hydrogen bonds. These inter­actions link the mol­ecules into sheets parallel to the ac plane. The sheets are stacked along the b axis by π–π inter­actions, with centroid–centroid distances of 3.6219 (7) Å. A weak O—H⋯π inter­action was also noted.

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.

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, C22H26O9, crystallizes with two independent mol­ecules in the asymmetric unit in which the dihedral angles between the two benzene rings are 21.4 (2) and 5.1 (2)°. An intra­molecular O—H⋯O hydrogen bond occurs in each mol­ecule. Inter­molecular C—H⋯O hydrogen bonds stabilize the crystal structure.

In the title compound, C36H32N2O4S, the piperidine ring adopts a chair conformation, while the five-membered pyrrolidine (with a C atom as the flap atom) and thia­zolidine (with the S atom as the flap atom) rings adopt envelope conformations. The naphthalene ring system makes dihedral angles of 18.82 (5) and 40.92 (5)° with the two meth­oxy-substituted benzene rings. In the crystal, centrosymmetrically-related mol­ecules are linked into dimers via pairs of C—H⋯O and C—H⋯N hydrogen bonds. An intra­molecular O—H⋯N hydrogen bond is also observed. The crystal structure is further stabilized by C—H⋯π inter­actions.

In the title compound, C34H32N2O8, one of the pyrrolidine rings in the pyrrolizidine ring system adopts a twist conformation, whereas the other ring adopts an envelope conformation (C atom as flap). The five-membered ring in the indene ring system and the fused furan ring also adopt envelope conformations (C and O atoms as flaps, respectively). The β-lactam ring makes dihedral angles of 23.41 (2) and 25.98 (2)°, respectively, with the attached meth­oxy­phenyl and phen­oxy rings. The mol­ecular conformation is stabilized by an intra­molecular O—H⋯N hydrogen bond, generating an S(5) motif. In the crystal, mol­ecules are linked into C(12) chains running along the a axis by C—H⋯O hydrogen bonds. The structure is further consolidated by weak inter­molecular C—H⋯π and π–π inter­actions [centroid–centroid distance = 3.7987 (14) Å].

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 mol­ecule of the title compound, C15H15NO2, the aromatic rings are oriented at a dihedral angle of 15.46 (6)°. An intra­molecular O—H⋯N hydrogen bond results in the formation of a nearly planar six-membered ring [maximum deviation of 0.035 (5) Å for the N atom] which is almost coplanar with the adjacent ring, making a dihedral angle of 0.8 (3)°. The title organic mol­ecule is a phenol–imine tautomer, as evidenced by the C—O, C—N and C—C bond lengths. Mol­ecules are linked by inter­molecular C—H⋯O hydrogen bonds that generate a C(5) chain. C—H⋯π and π–π inter­actions exist in the structure. The π–π inter­action occurs between the phenol ring and its symmetry equivalent at (1 − x, 1 − y, −z), with a centroid–centroid distance of 3.727 (7) Å and a plane-to-plane separation of 3.383 (5) Å, resulting in an offset angle of 24.82 (1)°.

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 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 mol­ecule, C24H32O10, one tert-butyl ester group is folded towards the central benzene ring while the other is directed away. The acetyl group is almost perpendicular to the benzene ring to which it is connected [C—C—O—C torsion angle = 90.4 (12)°]. The conformation about the ethene bond [1.313 (7) Å] is E. The atoms of the benzene ring and its attached ester group and part of the hy­droxy tert-butyl ester side chain are disordered over two sets of sites in a 50:50 ratio. Linear supra­molecular chains along the a axis mediated by hy­droxy–carbonyl O—H⋯O hydrogen bonds feature in the crystal packing. The same H atom also partakes in an intra­molecular O—H⋯O inter­action.

In the title mol­ecule, C28H28O9, the phenol and the benzene rings adjacent to the α,β-unsaturated ketone unit are inclined at 9.15 (13)° to each other. The terminal phenyl ring is oriented with respect to the phenol ring at a dihedral angle of 85.88 (13)°. In the crystal, the methyl­ene C atoms of the dihydro­dioxine ring are disordered over two sites with an occupancy ratio of 0.463 (18):0.537 (18), and both disordered components of the dihydro­dioxine ring adopt twisted-chair conformations. An intra­molecular O—H⋯O hydrogen bond and weak inter­molecular C—H⋯O hydrogen bonds are present in the crystal structure.

In the mol­ecule of the title compound, C18H14O3, there is an intra­molecular O—H⋯O=C hydrogen bond between the carbonyl and hy­droxy groups on the naphthalene ring system. The angles between the C=O bond vector and the least-squares planes of the naphthalene ring system and the phenyl ring are 30.58 (6) and 42.82 (7)°, respectively, while the dihedral angle between the naphthalene ring system and the phenyl ring is 58.65 (5)°. In the crystal, mol­ecules are connected by pairs of inter­molecular O—H⋯O=C hydrogen bonds, forming centrosymmetric dimers.

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.

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)°.

In the title compound, C11H15N3O3S, the C—S—N(H)—N linkage is nonplanar, the torsion angle being 75.70 (12)°. The compound has two almost planar fragments linked to the S atom: the hydrazone-derivative fragment [(HONC4H6)N—N(H)–] and the tolyl fragment (C7H7–) have maximum deviations from the mean plane through the non-H atoms of 0.0260 (10) and 0.0148 (14) Å, respectively. The two planar fragments make an inter­planar angle of 79.47 (5)°. In the crystal, mol­ecules are connected through inversion centers via pairs of N—H⋯O and O—H⋯N hydrogen bonds.

In the title compound, C17H19NO3, the dihedral angle between the benzene rings is 68.0 (1)°. The C—O—C—C torsion angle of the atoms joining these rings is 179.7 (2)°. The atoms of the methanol group were refined as disordered over two sets of sites with fixed occupancies of 0.86 and 0.14. The H atoms of the hy­droxy group in the major component are disordered over a further two sets of sites with equal occupancies. This is a necessary arrangement to allow for hydrogen bonding without unrealistic H⋯H contacts. In the crystal, O—H⋯N and O—H⋯O hydrogen bonds connect mol­ecules into chains along [001].