α,β-Bis(N-methylanilino)stilbene

C28H26N2, monoclinic, P21, a = 9.94 (2), b = 14.58(3), c = 7.91 (2) A, fl = 106.5 (2) ° , V = 1099.86/~3, Z = 2; O m = 1. 177, D x = 1. 179 g cm-3; F(000) = 416. Full-matrix least-squares refinement gave R = 0.084 and R w = 0.072 for 375 parameters and 1928 significant reflexions. The molecule exhibits a eis configuration and the phenyl groups are twisted out of the plane of the ethylene group to avoid steric hindrance. The N atoms have a planar configuration. Introduction. An unsolved configuration led us to in- vestigate the structure of C28H26N 2. Yellow-orange crystals, recrystallized from benzene at room tem- perature, were provided by Henning Lund. A crystal 0-78 × 0.40 × 0.25 mm was mounted along a. Weissenberg photographs showed systematic absences of reflexions 0k0 for k odd. Intensities were collected with a linear diffractometer (Arndt & Phillips, 1961), using monochromated Mo K(t radiation up to sin 0ma x = 0-5. The background-peak-background