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3,5-Dimeth-oxy-2-[(4-propyl-phen-yl)imino-meth-yl]phenol.

ABSTRACT: The title compound, C(18)H(21)NO(3), crystallizes in the phenol-imine tautomeric form, with the H atom attached to oxygen rather than on nitro-gen. This H atom is involved in a strong intra-molecular O-H⋯N hydrogen bond. A C-H⋯π inter-action is also present. The dihedral angle between the aromatic rings is 12.23 (7)°.

SUBMITTER: Sahin ZS

PROVIDER: S-EPMC2968940 | biostudies-literature |

REPOSITORIES: biostudies-literature

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(E)-4-[(3,5-Dimethyl-phen-yl)imino-meth-yl]-2-meth-oxy-3-nitro-phenol.

Project description:The mol-ecule of the title compound, C(16)H(16)N(2)O(4), exists in the E configuration with respect to the central C=N double bond. The dihedral angle between the two benzene rings is 2.17?(9)?Å. In the crystal, mol-ecules are linked via O-H?N hydrogen bonds into chains that propagate along the b-axis direction. There is also ?-? stacking of inversion-related mol-ecules, with inter-planar spacings of 3.479?(5)?Å and ring centroid-centroid distances of 3.876?(4)?Å.

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5-Diethyl-amino-2-[(E)-(2,4-dimeth-oxy-phen-yl)imino-meth-yl]phenol.

Project description:The title Schiff base, C(19)H(24)N(2)O(3), exists in the crystal structure in the phenol-imine tautomeric form with an intra-molecular O-H?N hydrogen bond. The planes of the aromatic rings form a dihedral angle of 36.8?(8)°. The crystal packing is characterized by C-H?O hydrogen bonds and ?-? stacking inter-actions [centroid-centroid distance = 3.478?(4)Å].

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Crystal structure of (<i>E</i>)-2,6-dimeth-oxy-4-{[(4-meth-oxy-phen-yl)imino]-meth-yl}phenol.

Project description:In the title compound, C16H17NO4, the dihedral angle between benzene rings is 72.7 (2)°. The meth-oxy groups are rotated by 2.4 (2) and -4.9 (2) (benzil-idene moiety) and by 5.6 (3)° (aniline moiety) relative to the adjacent benzene ring. In the crystal, the mol-ecules are linked into chains along [101] through C-H⋯O and O-H⋯N hydrogen bonds.

| S-EPMC6218903 | biostudies-literature

3-Meth-oxy-2-[(E)-(4-meth-oxy-phen-yl)imino-meth-yl]phenol.

Project description:The title compound, C(15)H(15)NO(3), adopts the enol-imine tautomeric form. The two rings are twisted with respect to each other, making a dihedral angle of 44.08 (5)°. The 3-methoxy-2-[(E)-(4-methoxyphenyl)-iminomethyl]phenol unit is almost planar, the largest deviation from the mean plane being 0.047 (2) Å. Such a planar conformation might be related to the occurrence of an intra-molecular O-H⋯N hydrogen bond. In the crystal, inter-molecular C-H⋯O hydrogen bonds link the mol-ecules into sheets parallel to (010). These sheets are inter-connected by weak C-H⋯π inter-actions.

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2-[(2,4-Dimethyl-phen-yl)imino-meth-yl]-3,5-dimethoxy-phenol.

Project description:X-ray analysis reveals that the title Schiff base compound, C(17)H(19)NO(3), possesses both OH and NH tautomeric character in its mol-ecular structure. The occupancies of the enol and keto tautomers are 0.62?(3) and 0.38?(3), respectively. The presence of the minor keto form could not be confirmed from the IR spectrum. The mol-ecule is approximately planar, the dihedral angle between the planes of the two aromatic rings being 6.97?(8)°. The mol-ecular structure of the major component is stabilized by an intra-molecular O-H?N hydrogen bond, which generates an S(6) ring motif (N-H?O hydrogen bond in the minor component).

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2-[(4-Ethyl-phen-yl)imino-meth-yl]-3,5-dimethoxy-phenol.

Project description:The title compound, C(17)H(19)NO(3), adopts the phenol-imine tautomeric form, with a resonance-assisted O-H?N intra-molecular hydrogen bond [O?N = 2.551?(3)?Å]. The dihedral angle between the two benzene rings is 45.42?(7)°. The two meth-oxy groups are coplanar with the attached benzene ring [C-O-C-C torsion angles = -1.1?(5) and 3.2?(4)°].

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2-[(4-Meth-oxy-2-nitro-phen-yl)imino-meth-yl]phenol.

Project description:The crystal structure of the title compound, C(14)H(12)N(2)O(4), contains four crystallographically independent mol-ecules in the asymmetric unit. All the mol-ecules have similar conformations; the dihedral angles between the aromatic rings are 33.1?(1), 33.76?(9), 31.41?(9) and 32.56?(10)°. Intra-molecular O-H?N hydrogen bonds form S(6) ring motifs in each molecule. In the crystal, there are two pairs of pseudo-inversion-related mol-ecules. Along the c axis, mol-ecules are stacked with ?-? inter-actions between the 2-hy-droxy-phenyl and 4-meth-oxy-2-nitro-phenyl rings [centroid-centroid distances = 3.5441?(12)-3.7698?(12)?Å].

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5-Bromo-2-meth-oxy-4-{[(4-meth-oxy-phen-yl)imino]-meth-yl}phenol monohydrate.

Project description:The crystal structure of the title compound, C(15)H(14)BrNO(3)·H(2)O, has a trans configuration about the central C=N double bond. An intra-molecular O-H⋯O hydrogen bond occurs in the main mol-ecule. The crystal packing is stabilized by strong O-H⋯O and O-H⋯N hydrogen bonds.

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4-[(E)-(4-Eth-oxy-phen-yl)imino-meth-yl]phenol.

Project description:In the title compound, C(15)H(15)NO(2), the dihedral angle between the benzene rings is 52.04 (5)° and the mol-ecule has an E conformation about the central C=N bond. In the crystal, mol-ecules are connected by O-H⋯N hydrogen bonds, forming zigzag chains along the b axis. The crystal packing also features weak C-H⋯O inter-actions.

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(E)-4-[(4-Bromo-phen-yl)imino-meth-yl]-2-meth-oxy-phenol.

Project description:In the crystal structure of the title compound, C(14)H(12)BrNO(2), the dihedral angle between the rings is 37.87 (10)° and the mol-ecule has an E conformation about the central C=N bond. In the crystal, mol-ecules are connected by inter-molecular O-H⋯N hydrogen bonds into zigzag chains running parallel to the b axis. The packing also features C-H⋯O inter-actions.

| S-EPMC3414922 | biostudies-literature

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