1-(4-Methoxy-Phenyl)-4-(4-Methyl-Phenyl)-3-Phenoxy-Azetidin-2-one

Abstract

The central β-lactam ring of the title compound, C<inf>23</inf>H <inf>21</inf>NO<inf>3</inf>, is almost planar (r.m.s. deviation = 0.032Å). The methoxybenzene ring is almost coplanar with the β-lactam ring [dihedral angle = 1.87 (11)°], whereas the tolyl ring is almost normal to it [75.73 (12)°]. The dihedral angle between the β-lactam ring and the O-bonded phenyl ring is 51.95 (12)°. An intramolecular C -H⋯O interaction generates an S(6) ring. The crystal structure features intermolecular C -H⋯O hydrogen bonds, forming layers parallel to (011), and weak C -H⋯π interactions. Two aromatic π-π stacking interactions [centroidcentroid distances = 3.6744 (12) and 3.6799 (11) Å] are also observed.