2,3-Bis{[2,3-dimethyl-6-(phenyl­vin­yl)phen­yl]imino}­butane

In the title compound, C₃₆H₃₆N₂, a product of the condensation reaction of 2,3-dimethyl-6-phenyl­vinyl­benzenamine and 2,3-butane­dione, the complete mol­ecule is generated by the application of an inversion centre. The central C-C bond in the 1,4-di­aza­butadiene fragment is trans-configured and situated about the inversion center. The dihedral angle between the ring attached to N and the 1,4-di­aza­butadiene plane is 78.24 (36)°, while the 1,4-di­aza­butadiene plane makes an angle of 30.71 (26)° with the phenyl ring.

2-((E)-{4-[Bis(4-eth­oxy­phen­yl)amino]­phen­yl}imino­meth­yl)phenol

In the title Schiff base mol­ecule, C₂₉H₂₈N₂O₃, the three terminal benzene rings are twisted by 73.84 (15), 81.25 (16) and 12.1 (2)° with respect to the central benzene ring. An intra­molecular O—H...N hydrogen bond occurs. In the crystal, mol­ecules are linked via weak C—H...π inter­actions into a three-dimensional supra­molecular architecture.

2-{(E)-[4-(Di­phenyl­amino)­phen­yl]imino­meth­yl}phenol

The asymmetric unit of the title Schiff base molecule, C₂₅H₂₀N₂O, contains two independent mol­ecules. In each mol­ecule, the C=N bond is in an E conformation. The most significant difference between the two mol­ecules is seen for the dihedral angles between the meth­oxy-substituted benzene ring and the two phenyl rings, which are 85.5 (1) and 82.3 (1)° in the first mol­ecule, and 49.0 (1) and 40.4 (1)° in the second. This conformational difference is reflected in the central C=N—C[pdbond]C torsion angle, which is 28.7 (2)° in the first mol­ecule and −29.8 (3)° in the other. In each mol­ecule, there is an intra­molecular O—H...N hydrogen bond.

2,3-Bis[(3-methyl­biphenyl-4-yl)imino]­butane

The title compound, C₃₀H₂₈N₂, is a product of the condensation reaction of 2-methyl-4-phenyl­aniline and butane-2,3-dione. The mol­ecule lies on a crystallographic inversion centre. The C=N bond has an E conformation. The dihedral angle between the two benzene rings of the 4-phenyl-2-methyl­phenyl group is 29.19 (76)°. The 1,4-di­aza­butadiene plane makes an angle of 70.1 (10)° with the N-bonded methyl­phenyl ring and an angle of 81.08 (97)° with the terminal phenyl group.