title: 3,3-Dimethyl-9-phenyl-3,4-dihydro-acridin-1(2H)-one.
abstract: In the mol-ecule of the title compound, C(21)H(19)NO, the terminal saturated six-membered ring of the dihydro-acridine unit adopts an envelope conformation, while the other two fused rings are nearly coplanar, with a dihedral angle of 2.61 (3)°. The coplanar ring system is oriented with respect to the phenyl ring at a dihedral angle of 74.58 (3)°. In the crystal structure, there is a C-H⋯π contact between the central ring of the dihydro-acridine system and the phenyl ring and a π-π contact between the two central rings [centroid-centroid distance = 3.809 (1) Å].
authors.affiliation: Department of Chemistry, Islamic Azad University, Dorood Branch, Dorood 688173551, Iran.
authors.forename: Hosein
authors.initials: H
authors.lastname: Ghorbani
authors.forename: Ayoob
authors.initials: A
authors.lastname: Bazgir