ACTA CRYSTALLOGRAPHICA SECTION E-STRUCTURE REPORTS ONLINE, vol.62, 2006 (SCI-Expanded)
In the structure of the title compound, C21H17NO2, the four-membered beta-lactam ring is nearly planar, with long C-C distances of 1.526 (3) and 1.567 (3) A. The angles between the planes of the three phenyl rings and this group are 81.12 (8), 3.02 (8) and 49.88 (7)degrees. The dihedral angles between the planes of the phenyl rings are 83.72 (7), 68.03 (7) and 47.06 (6)degrees. The crystal structure is stabilized by inter- and intramolecular C-H center dot center dot center dot O hydrogen-bond interactions.