N-Benzyl-4-methyl-6-phenyl­pyrimidin-2-amine

In the title compound, C18H17N3, the dihedral angles between the central pyrimidine ring and its directly-bonded and N-bonded pendant phenyl rings are 25.48 (6) and 80.33 (6)°, respectively. The dihedral angle between the phenyl rings is 79.66 (6)°. In the crystal, inversion dimers linked by pairs of N—H⋯N hydrogen bonds generate R 2 2(8) loops. The crystal structure also features weak π–π [centroid–centroid separation = 3.6720 (7) Å] and C—H⋯π inter­actions

N-Butyl-4,6-diphenyl­pyrimidin-2-amine

In the title compound, C20H21N3, the pyrimidine ring is inclined at dihedral angles of 51.57 (4) and 2.49 (4)° to the two phenyl rings. The dihedral angle between the two terminal phenyl rings is 50.44 (4)°. In the crystal, adjacent mol­ecules are linked via a pair of N—H⋯N hydrogen bonds, forming an inversion dimer with an R 2 2(8) ring motif. Furthermore, the crystal structure is stabilized by a weak π–π inter­action, with a centroid–centroid distance of 3.6065 (5) Å