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5,7-Bis(benz-yloxy)-2-phenyl-4H-chromen-4-one.

ABSTRACT: In the title compound, C(29)H(22)O(4), the chromene ring is almost planar with a small puckering [0.143 (2) Å]. The crystal structure is stabilized by C-H⋯O and C-H⋯π inter-actions. Edge-to-face (centroid-centroid distances of 3.894 and 3.673 Å) and face-to-face (centroid-centroid distance of 3.460 Å) π-π-ring electron inter-actions are also observed.

SUBMITTER: Nallasivam A

PROVIDER: S-EPMC2959925 | biostudies-literature |

REPOSITORIES: biostudies-literature

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5,7-Bis(benz-yloxy)-2-[4-(benz-yloxy)phen-yl]-4H-chromen-4-one.

Project description:In the title compound, C(36)H(28)O(5), the terminal benzene rings are twisted at dihedral angles of 6.75?(12), 70.86?(14) and 82.02?(12)° with the respect to the central plana r[maximum deviation = 0.070?(3)?Å] chromen-4-one ring system. In the crystal structure, ?-? stacking is observed between parallel benzene rings of adjacent mol-ecules [centroid-centroid distance = 3.7459?(16)?Å].

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5,7-Dimeth-oxy-2-phenyl-4H-chromen-4-one.

Project description:The asymmetric unit of the title compound, C(17)H(14)O(4), contains two independent mol-ecules which differ in the relative orientations of the phenyl rings with repect to the essentially planar [maximum deviations of 0.029?(2) and 0.050?(2)?Å in the two mol-ecules] chromene fused-ring system, forming dihedral angles of 10.3?(5) and 30.86?(5)° in the two mol-ecules. The crystal structure is stabilized by weak C-H?O and C--H?? inter-actions, and ?-? stacking inter-actions.

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2-Phenyl-5,7-bis-(prop-2-en-1-yl-oxy)-4H-chromen-4-one.

Project description:In the title compound, C(21)H(18)O(4), tthe dihedral angle between the chromene ring system and the pendant phenyl ring is 6.1?(1)°. The crystal structure is stabilized by an intermolecular C-H?O and C-H?? inter-actions.

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3-(4-Nitro-benz-yl)-4H-chromen-4-one.

Project description:In the title compound, C16H11NO4, the dihedral angle between the ten-membered chromen-4-one ring system (r.m.s. deviation = 0.0095 Å) and the benzene ring is 86.16 (5)°. In the crystal, mol-ecules are linked into a three-dimensional network by weak C-H⋯O hydrogen bonds. The crystal studied was a non-merohedral twin, with the minor twin component refining to 0.093 (1).

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2-(5,7-Dimeth-oxy-4-oxo-4H-chromen-2-yl)phenyl 4-toluene-sulfonate.

Project description:In the crystal structure of the title compound, C(24)H(20)O(7)S, the chromone system makes a dihedral angle of 37.32 (7)° with the adjacent benzene ring. The chromone ring system and the tolyl ring are almost parallel, with a dihedral angle of 4.56 (9)°. The tolyl ring is twisted at an angle of 41.75 (6)° with respect to the benzene ring. Weak intra- and inter-molecular C-H⋯O inter-actions are observed.

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6-Benz-yloxy-2-phenyl-pyridazin-3(2H)-one.

Project description:In the title compound, C(17)H(14)N(2)O(2), the central pyridazine ring forms dihedral angles of 47.29?(5) and 88.54?(5)° with the benzene rings, while the dihedral angle between the benzene rings is 62.68?(6)°. In the crystal, molecules are linked by two weak C-H?O hydrogen bonds and three weak C-H?? inter-actions.

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2-Benz-yloxy-1,2,4-triazolo[1,5-a]quinazolin-5(4H)-one.

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3-(3-Nitro-benz-yl)-4H-chromen-4-one.

Project description:In the title compound, C16H11NO4, the dihedral angle between the 10-membered coplanar chromone ring system and the benzene ring is 77.83?(3)°. In the crystal, weak C-H?O hydrogen bonds link the mol-ecules into a three-dimensional network.

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8-Hydr-oxy-5,6,7-trimeth-oxy-2-phenyl-4H-chromen-4-one.

Project description:In the title compound, C(18)H(16)O(6), the benzopyran group is essentially planar, with the O atoms of the substituent groups lying close to its mean plane. The mol-ecular conformation is governed by intra-molecular inter-actions. The crystal packing is mainly determined by one classical inter-molecular hydrogen bond which gives rise to the formation of an infinite chain along the a axis.

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8-Benz-yloxy-2-methyl-3-(2-methyl-phenyl)quinazolin-4(3H)-one.

Project description:In the title methaqua-lone analogue, C(23)H(20)N(2)O(2), the planes of the terminal aromatic rings [dihedral angle between them = 64.52 (7)°] approximately face the fused-ring methyl group and both are twisted with respect to the pyrimidine plane (r.m.s. deviation = 0.028 Å), forming dihedral angles of 86.9 (3) (with the 2-tolyl ring) and 65.57 (7)°. The 2-tolyl residue is disordered over two almost coplanar but opposite orientations with the major component having a site-occupancy factor of 0.893 (3). The three-dimensional crystal packing is consolidated by C-H⋯O, C-H⋯π and π-π [2-tol-yl-2-tolyl centroid-centroid distance = 3.8099 (6) Å] inter-actions.

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