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7-Meth-oxy-3-(4-meth-oxy-phen-yl)chroman-4-one.

ABSTRACT: The asymmetric unit of the title compound, C(17)H(16)O(4), contains two crystallographically independent mol-ecules with different absolute configurations.

SUBMITTER: Peng ZY

PROVIDER: S-EPMC3274945 | biostudies-literature |

REPOSITORIES: biostudies-literature

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2-(4-Chloro-phen-yl)-6-meth-oxy-chroman-4-one.

Project description:In the title mol-ecule, C(16)H(13)Cl O(3), the two aromatic rings form a dihedral angle of 65.3?(1)°. In the crystal structure, weak inter-molecular C-H?O hydrogen bonds link the mol-ecules into centrosymmetric dimers, which are further packed into columns propagating in [100] by weak C-H?? inter-actions.

| S-EPMC2983332 | biostudies-other

3-(4-Hy-droxy-phen-yl)-7-meth-oxy-chroman-4-one monohydrate.

Project description:In the title compound, C(16)H(14)O(4)·H(2)O, the dihedral angle betwen the benzene rings is 71.4?(6)°. The pyran ring is in a sofa conformation. In the crystal, O-H?O hydrogen bonds connect the components into a two-dimensional network parallel to (010), incorporating C(2) (2)(4) and C(2) (2)(11) chains. In addition, weak C-H?O, C-H?? and ?-? stacking inter-actions [centroid-centroid distance = 3.768?(2)?Å] are present.

| S-EPMC3238877 | biostudies-other

(E)-1-[2-Hy-droxy-4,6-bis-(meth-oxy-meth-oxy)phen-yl]-3-[3-meth-oxy-4-(meth-oxy-meth-oxy)phen-yl]prop-2-en-1-one.

Project description:The title compound, C(22)H(26)O(9), crystallizes with two independent mol-ecules in the asymmetric unit in which the dihedral angles between the two benzene rings are 21.4?(2) and 5.1?(2)°. An intra-molecular O-H?O hydrogen bond occurs in each mol-ecule. Inter-molecular C-H?O hydrogen bonds stabilize the crystal structure.

| S-EPMC3247344 | biostudies-literature

1-(4-Meth-oxy-phen-yl)-4-(4-methyl-phen-yl)-3-phen-oxy-azetidin-2-one.

Project description:The central β-lactam ring of the title compound, C(23)H(21)NO(3), is almost planar (r.m.s. deviation = 0.032Å). The meth-oxy-benzene ring is almost coplanar with the β-lactam ring [dihedral angle = 1.87 (11)°], whereas the tolyl ring is almost normal to it [75.73 (12)°]. The dihedral angle between the β-lactam ring and the O-bonded phenyl ring is 51.95 (12)°. An intra-molecular C-H⋯O inter-action generates an S(6) ring. The crystal structure features inter-molecular C-H⋯O hydrogen bonds, forming layers parallel to (011), and weak C-H⋯π inter-actions. Two aromatic π-π stacking inter-actions [centroid-centroid distances = 3.6744 (12) and 3.6799 (11) Å] are also observed.

| S-EPMC3051730 | biostudies-literature

1-(4-Meth-oxy-phen-yl)-4-(3-nitro-phen-yl)-3-phen-oxy-azetidin-2-one.

Project description:In the title compound, C(22)H(18)N(2)O(5), the four-membered β-lactam ring is nearly planar, with a maximum deviation of 0.023 (2) Å for the N atom, and has long C-C distances of 1.525 (5) and 1.571 (5) Å. The mean plane of this group makes dihedral angles of 11.61 (19), 74.5 (2) and 72.3 (2)° with three aromatic rings. An intra-molecular C-H⋯O hydrogen bond occurs. The packing of the mol-ecules in the crystal structure is governed mainly by inter-molecular C-H⋯O hydrogen-bonding and C-H⋯π stacking inter-actions. Furthermore, a π-π inter-action [centroid-centroid distance = 3.6129 (19) Å] helps to stabilize the crystal structure.

| S-EPMC3051763 | biostudies-literature

3-(2,4-Dichloro-phen-oxy)-1-(4-meth-oxy-phen-yl)-4-(3-nitro-phen-yl)azetidin-2-one.

Project description:In the title compound, C(22)H(16)Cl(2)N(2)O(5), the nearly planar four-membered ?-lactam ring [maximum deviations of 0.011?(2) for the N atom] makes dihedral angles of 68.34?(13), 83.04?(13) and 3.37?(13)° with the dichloro-, nitro- and meth-oxy-phenyl rings, respectively. The crystal structure is stabilized by C-H?O hydrogen-bond inter-actions. In addition, a ?-? stacking inter-action [centroid-centroid distance = 3.6622?(12)?Å] is observed between the ?-lactam and nitro-phenyl rings.

| S-EPMC3050394 | biostudies-literature

3-(3-Meth-oxy-benzyl-idene)chroman-4-one.

Project description:In the title compound, C(17)H(14)O(3), the dihedral angle between the meth-oxy-benzene unit and the benzene ring of the chromanone system is 64.12 (3)°. The crystal structure is stabilized by weak C-H⋯O inter-actions.

| S-EPMC3343972 | biostudies-literature

(E)-1-(4-Meth-oxy-phen-yl)-3-(2,4,6-trimeth-oxy-phen-yl)prop-2-en-1-one.

Project description:In the title compound, C(19)H(20)O(5), the dihedral angle between the two aromatic rings is 18.23?(4)°. The crystal structure exhibits only weak C-H?? and C-H?O contacts between the mol-ecules.

| S-EPMC3120626 | biostudies-literature

(E)-1-(4-Meth-oxy-phen-yl)-3-(3,4,5-trimeth-oxy-phen-yl)prop-2-en-1-one.

Project description:The title compound, C(19)H(20)O(5), was synthesized by reaction of 4-meth-oxy-acetophenone and 3,4,5-trimeth-oxy-benzaldehyde. The aromatic rings form a dihedral angle of 36.39?(7)°. Two intramolecular C-H?O hydrogen bonds occur. The crystal packing features weak C-H?O inter-actions.

| S-EPMC3213567 | biostudies-literature

(E)-3-(3,5-Dimeth-oxy-phen-yl)-1-(2-meth-oxy-phen-yl)prop-2-en-1-one.

Project description:In the title mol-ecule, C18H18O4, the dihedral angle between the benzene rings is 52.52?(7)°. The C=C bond of the central enone group adopts a trans conformation. The relative conformation of the two double bonds in the enone group is s-transoid. In the crystal, mol-ecules are linked by pairs of weak C-H?O hydrogen bonds, forming inversion dimers.

| S-EPMC3629573 | biostudies-literature

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