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1.  9-[(E)-2-(4-Chloro­phen­yl)ethen­yl]-3,3,6,6-tetra­methyl-2,3,4,5,6,7,8,9-octa­hydro-1H-xanthene-1,8-dione 
In the title compound, C25H27ClO3, each of the cyclo­hexenone rings adopts an envelope conformation, whereas the six-membered pyran ring adopts a flattened boat conformation, with the O and methine C atoms deviating from the plane of the other four atoms. The C=C double bond is in the trans conformation. In the crystal, weak C—H⋯O hydrogen bonds link the mol­ecules into chains running parallel to the b axis.
PMCID: PMC3790409  PMID: 24098228
2.  (E)-N-(3,3-Di­phenyl­allyl­idene)-2-(tri­fluoro­meth­yl)aniline 
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—H⋯F hydrogen bonds link the mol­ecules into chains parallel to the b-axis direction.
PMCID: PMC3648283  PMID: 23723903
3.  (E)-N-(3,3-Diphenyl­allyl­idene)-4-nitro­aniline 
In the title compound, C21H16N2O2, the dihedral angles between the mean planes of the 4-nitro­phenyl ring and the two phenyl rings are 57.3 (5) and 16.8 (6)°. The imine group displays a C—C—N—C torsion angle of −24.9 (3)°.
PMCID: PMC3470385  PMID: 23125798

Results 1-3 (3)