organic compounds
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In the title compound, C25H29FO4, each cyclohexenone ring has an envelope conformation with the dimethyl-substituted atom as the flap. The hydroxy and carbonyl groups form two intramolecular O—HO hydrogen bonds, as is typical for xanthene derivatives. In the crystal, very weak C—HO hydrogen bonds link molecules into dimers.
organic compounds
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In the title compound, C19H14N2O2, the dihedral angle between the mean planes of the 4-nitrophenyl ring and the naphthalene ring system is 12.79 (2)°. The imine group displays a C—C—N=C torsion angle of 41.0 (2)° and the C=N group has an E conformation. In the crystal, weak C—HO hydrogen bonds link molecules into layers parallel to the b axis.
organic compounds
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In the title compound, C22H16F3N, the C=N bond of the central imine group adopts an E conformation. The dihedral angles between the 2-(trifluoromethyl)phenyl ring and the benzene rings are 9.34 (1) and 68.8 (1)°. The imine group displays a C—C—N=C torsion angle of 41.6 (3)°. In the crystal, weak C—HF hydrogen bonds link the molecules into chains parallel to the b-axis direction.
organic compounds
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In the title compound, C25H27FO3, each of the cyclohexenone rings adopts a half-chair conformation, whereas the six-membered pyran ring adopts a flattened boat conformation, with the O and methine C atoms deviating by 0.0769 (15) and 0.196 (2) Å, respectively, from the plane of the other four atoms (r.m.s. deviation = 0.004 Å). The C=C double bond adopts an E conformation. The dihedral angle between the benzene and pyran (all atoms) rings is 89.94 (10)°. In the crystal, weak C—HO hydrogen bonds link the molecules into chains running parallel to the b axis.
organic compounds
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The title compound, C25H19N, adopts an E conformation about the C=N bond. The naphthalene ring system and the phenyl rings form dihedral angles 38.1 (1), 46.9 (8) and 48.5 (1)°, respectively, with the mean plane of the central enimino fragment. The crystal packing exhibits no directional close contacts.
organic compounds
Open access
The title compound, C25H29ClO4, adopts a trans conformation about the C=C double bond and the dimethylcyclohexenone rings both show an envelope conformation with the dimethyl-substituted C atom as the flap. In the molecule, the hydroxy and carbonyl groups form two intramolecular O—HO hydrogen bonds typical for xanthene derivatives. In the crystal, weak C—HO hydrogen bonds link the molecules into chains running parallel to the a-axis direction.