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(E)-2-[(2,4,6-Tri-meth-oxy-benzyl-idene)amino]-phenol.

ABSTRACT: There are two independent mol-ecules in the asymmetric unit of the title compound, C16H17NO4, with similar conformations but some differences in their bond angles. Each mol-ecule adopts a trans configuration with respect to the methyl-idene C=N bond and is twisted with a dihedral angle between the two substituted benzene rings of 80.52 (7)° in one mol-ecule and 83.53 (7)° in the other. All meth-oxy groups are approximately coplanar with the attached benzene rings, with Cmeth-yl-O-C-C torsion angles ranging from -6.7 (2) to 5.07 (19)°. In the crystal, independent mol-ecules are linked together by O-H⋯N and O-H⋯O hydrogen bonds and a π-π inter-action [centroid-centroid distance of 3.6030 (9) Å], forming a dimer. The dimers are further linked by weak C-H⋯O inter-actions and another π-π inter-action [centroid-centroid distance of 3.9452 (9) Å] into layers lying parallel to the ab plane.

SUBMITTER: Kaewmanee N

PROVIDER: S-EPMC3914096 | biostudies-literature |

REPOSITORIES: biostudies-literature

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2-[(2-Meth-oxy-benzyl-idene)amino]-phenol.

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2-[({2-[(2-Hy-droxy-5-meth-oxy-benzyl-idene)amino]-eth-yl}imino)-meth-yl]-4-meth-oxy-phenol.

Project description:The asymmetric unit of the title compound, C(18)H(20)N(2)O(4), contains one-half mol-ecule with an inversion center located at the centroid of the mol-ecule. In the crystal, mol-ecules are linked by C-H?? inter-actions, forming layers parallel to (101). An intra-molecular O-H?N hydrogen bond also occurs.

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(E)-4-Meth-oxy-N'-(2,4,5-tri-meth-oxy-benzyl-idene)benzohydrazide hemihydrate.

Project description:The title compound crystallizes as a hemihydrate, C18H20N2O5·0.5H2O. The mol-ecule exists in an E conformation with respect to the C=N imine bond. The 4-meth-oxy-phenyl unit is disordered over two sets of sites with a refined occupancy ratio of 0.54?(2):0.46?(2). The dihedral angles between the benzene rings are 29.20?(9) and 26.59?(9)°, respectively, for the major and minor components of the 4-meth-oxy-substituted ring. All meth-oxy substituents lie close to the plane of the attached benzene rings [the Cmeth-yl-O-C-C torsion angles range from -4.0?(12) to 3.9?(2)°]. In the crystal, the components are linked into chains propagating along [001] via N-H?O and O-H?O hydrogen bonds and weak C-H?O inter-actions.

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Project description:The title compound, C(15)H(12)F(3)NO(3), is a Schiff base which adopts the cis-quinoid form in the solid state. The dihedral angle between the least-squares planes of the benzene rings being 3.6?(1)°. The F atoms of the -CF(3) group are disordered over two sets of sites with refined occupancies of 0.61?(5) and 0.39?(5). An intra-molecular N-H?O hydrogen bond occurs. The crystal structure is stabilized by inter-molecular O-H?O hydrogen bonds.

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Project description:The mol-ecule of the title compound, C15H15NO2, adopts a trans conformation with respect to the methyl-idene C=N bond and is twisted with a dihedral angle of 26.31?(5)° between the two substituted benzene rings. The eth-oxy group is almost coplanar with the bound benzene ring with a C-O-C-C torsion angle of -179.08?(9)°. In the crystal, mol-ecules are linked by O-H?N hydrogen bonds and weak C-H?O inter-actions into chains propagating in the [011] and [01-1] directions. C-H?? inter-actions are also present.

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Project description:The title phenyl-hydrazine derivative, C16H16N2O4, has a crystallographically imposed centre of symmetry. Except for the methyl group, all non-H atoms are almost coplanar (r.m.s. deviation = 0.0095?Å). Intra-molecular O-H?N hydrogen bonds are observed, generating S(6) graph-set ring motifs.

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2-{[2-(2-Hy-droxy-3-meth-oxy-benzyl-idene)hydrazin-1-yl-idene]meth-yl}-6-meth-oxy-phenol.

Project description:The title compound, C(16)H(16)N(2)O(4), was obtained from the reaction of hydrazine hydrate and o-vanilin in absolute ethanol. The mol-ecule is almost planar (except for the methyl H atoms), with a mean deviation from the plane of 0.0259?Å. The mol-ecular structure also exhibits an approximate non-crystallographic twofold axis. Intra-molecular O-H?N hydrogen bonds occur. In the crystal, inter-molecular C-H?O hydrogen bonds generate mol-ecular zigzag sheets. The sheets stack through C-H?? inter-actions, leading to a three-dimensional-network.

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4-(2,3,4-Trimeth-oxy-6-methyl-benzyl-idene-amino)phenol.

Project description:The asymmetric unit of the title compound, C(17)H(19)NO(4), contains two independent mol-ecules in which the dihedral angles between the two benzene rings are 83.1?(2) and 88.5?(2)°. Each mol-ecule adopts a trans configuration with respect to the C=N bond. In the crystal structure, mol-ecules are linked by inter-molecular O-H?N hydrogen bonds, forming two independent one-dimensional chains running along the b-axis direction.

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4-Fluoro-N-[(E)-3,4,5-tri-meth-oxy-benzyl-idene]aniline.

Project description:The title compound, C16H16FNO3, exists in a trans configuration with respect to the C=N bond [1.258?(2)?Å]. The central meth-oxy O atom deviates from the plane of the attached benzene ring by 0.0911?(14)?Å. The dihedral angle between the aromatic rings is 47.58?(11)°. The crystal structure features C-H?N and C-H?O inter-actions.

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Project description:The title Schiff base compound, C(14)H(14)N(2)O(3)S, is non-planar, with a dihedral angle of 24.16?(7)° between the benzene rings. In the crystal, N-H?O and N-H?N hydrogen bonds link the mol-ecules into a layer parallel to (011). Intra- and inter-layer C-H?O inter-actions and ?-? inter-actions [centroid-centroid distances = 3.8900?(9) and 3.9355?(8)?Å] are also present.

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