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9,9-Dimethyl-12-(4-nitro-phen-yl)-9,10-dihydro-12H-benzo[a]xanthen-11(8H)-one.

ABSTRACT: In the mol-ecular structure of the title compound, C(25)H(21)NO(4), the pyran ring adopts a flattened boat conformation, while the cyclo-hexenone ring is in an envelope conformation. The 4-nitro-phenyl ring is almost perpendicular to the pyran ring [dihedral angle = 89.39 (1)°]. In the crystal, mol-ecules are connected by inter-molecular C-H⋯O hydrogen bonds.

SUBMITTER: Li DL

PROVIDER: S-EPMC2972096 | biostudies-literature |

REPOSITORIES: biostudies-literature

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12-(4-Chloro-phen-yl)-9,9-dimethyl-9,10-dihydro-8H-benzo[a]xanthen-11(12H)-one.

Project description:The title compound, C(25)H(21)ClO(2), was synthesized via the three-component coupling of 4-chloro-benzaldehyde, 2-naphthol and 5,5-dimethyl-cyclo-hexane-1,3-dione. The pyran ring adopts a boat conformation, while the cyclo-hexenone ring is in an envelope conformation. The 4-chloro-phenyl ring is almost perpendicular to the pyran ring [dihedral angle = 87.39 (1)°]. In the crystal, mol-ecules are connected by inter-molecular C-H⋯O hydrogen bonds.

| S-EPMC2983494 | biostudies-literature

9,9-Dimethyl-12-phenyl-8,9-dihydro-12H-benzo[a]xanthen-11(10H)-one.

Project description:The title compound, C(25)H(22)O(2), was synthesized via the three-component coupling of benzaldehyde, 2-naphthol and 5,5-dimethyl-cyclo-hexane-1,3-dione. In the crystal structure, centrosymmetrically related mol-ecules are linked into dimers by pairs of inter-molecular C-H⋯O hydrogen bonds. The dimers are further connected into a three-dimensional network by π-π aromatic stacking inter-actions involving the naphthalene ring system, with centroid-centroid separations of 3.695 (7) Å.

| S-EPMC2971999 | biostudies-literature

12-(2-Methoxyphenyl)-9,9-dimethyl-8,9-dihydro-12H-benzo[a]xanthen-11(10H)-one.

Project description:The title compound, C(26)H(24)O(3), was synthesized via the coupling of 2-methoxy-benzaldehyde, 2-naphthol and 5,5-dimethyl-cyclo-hexane-1,3-dione. The pyran ring adopts a boat conformation, while the cyclo-hexenone ring is in an envelope conformation. The 2-methoxy-phenyl ring is almost perpendic-ular to the plane through the four C atoms of the pyran ring [dihedral angle = 88.76?(9)°].

| S-EPMC2980265 | biostudies-literature

12-(2-Hy-droxy-6-oxo-cyclo-hex-1-en-yl)-9,10-di-hydro-8H-benzo[a]xanthen-11(12H)-one.

Project description:In the xanthenone system of the title compound, C23H20O4, the pyran ring has a maximum deviation of 0.111?(1)?Å from planarity and the outer cyclo-hexene ring exhibits a puckered conformation. The three methyl-ene C atoms of the cyclo-hexene ring bonded to the pyran unit are disordered over two sets of sites [occupancies = 0.570?(3) and 0.430?(3)]. In the crystal, mol-ecules are linked by C-H?O and O-H?O hydrogen bonds, forming a two-dimensional network parallel to (110). A C-H?? inter-action occurs between these networks.

| S-EPMC3790420 | biostudies-literature

9,9-Dimethyl-9,10-dihydroanthracene.

Project description:In the title compound, C(16)H(16), the central benzene ring adopts a boat conformation, with a dihedral angle of 34.7 (9)° between the mean planes of the two fused benzene rings. The two methyl groups at the apex of the central benzene ring are in axial and equatorial conformations. The crystal packing is stabilized by weak C-H⋯π inter-molecular inter-actions.

| S-EPMC3200971 | biostudies-literature

9,10-Dimethyl-9,10-per-oxy-9,10-dihydro-anthracene.

Project description:The structure of the title compound, C(16)H(14)O(2), contains one half-mol-ecule in the asymmetric unit and the mol-ecule is located on a mirror plane. The dihedral angle between the two benzene ring planes is 53.07 (6)°. The crystal structure involves intermolecular C-H⋯O hydrogen bonds.

| S-EPMC2961065 | biostudies-literature

9,9-Dimethyl-12-(3-nitro-phen-yl)-7,8,9,10,11,12-hexa-hydro-benz[a]acridin-11-one.

Project description:The title compound, C(25)H(22)N(2)O(3), was synthesized by the reaction of 3-nitro-benzaldehyde, dimedone and 2-naphthyl-amine in ethanol. In the mol-ecular structure, the cyclo-hexenone ring adopts an envelope conformation, whereas the piperidine ring has a boat conformation. The crystal packing is stabilized by inter-molecular N-H⋯O hydrogen bonds.

| S-EPMC2969871 | biostudies-literature

7-(3-Nitro-phen-yl)-9,10-dihydro-7H-benzo[h]cyclo-penta-[b]quinolin-8(11H)-one.

Project description:In the title compound, C(22)H(16)N(2)O(3), the naphthalene ring, the 1,4-dihydro-pyridine ring and the cyclo-pent-2-enone ring are nearly coplanar, with the dihedral angles between the neighbouring rings being 1.93?(11) and 2.30?(9)°, respectively. The benzene ring group at position 7 and the 1,4-dihydro-pyridine ring form a dihedral angle of 78.75?(4)°. Inter-molecular N-H?O hydrogen bonds and C-H?? inter-actions stabilize the crystal packing.

| S-EPMC3247459 | biostudies-literature

9-[3-(Dimethyl-amino)-prop-yl]-10,10-dimethyl-9,10-dihydro-anthracen-9-ol.

Project description:The asymmetric unit of the title compound, C(21)H(27)NO, contains two mol-ecules (A and B). In mol-ecule A, the central ring of the anthrone unit adopts a shallow boat conformation and the dihedral angle between the benzene rings is 18.96?(7)°. In mol-ecule B, the central ring is close to being planar (r.m.s. deviation = 0.078?Å) and the dihedral angle between the aromatic rings is 7.82?(7)°. In the crystal, mol-ecules are linked by O-H?N hydrogen bonds, forming zigzag C(7) chains of alternating A and B mol-ecules running parallel to [100]. The structure also features weak C-H?O and C-H?? inter-actions.

| S-EPMC3569237 | biostudies-literature

9,10-Dihydro-7H-benzo[de]imidazo[2,1-a]isoquinolin-7-one.

Project description:In the title compound, C(14)H(10)N(2)O, all non-H atoms are essentially coplanar (r.m.s. deviation = 0.013?Å). The crystal structure is stabilized by ?-? stacking inter-actions [centroid-centroid distance = 3.506?(3)?Å].

| S-EPMC3379446 | biostudies-literature

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