The title compound, C(60)H(68)N(6), was prepared by Horner olefination of a terephthaldialdehyde and a diaryl-methyl phospho-nate. There is one half-mol-ecule, located on an inversion centre, in the asymmetric unit. The dihedral angle between the plane of the vinyl-ene unit and the central ring is 36.79 (15)°, while those between the vinyl-ene unit and the lateral phenyl rings are 53.04 (10) and 53.74 (9)°.