1-(4-tert-Butyl­benz­yl)pyrimidine-2,4(1H,3H)-dione

The asymmetric unit of the title compound, C₁₅H₁₈N₂O₂, contains two independent mol­ecules with essentially identical geometries and conformations. The dihedral angles between the benzene and pyrimidine rings in the two mol­ecules are 89.96 (11) and 73.91 (11)°. The six methyl groups are disordered over two sets of sites, with site occupancies of 0.545 (4):0.455 (4) and 0.542 (7):0.458 (7) in the two mol­ecules. The crystal structure is stabilized by N—H...O hydrogen bonds.

6-Benz­yloxy-2-phenyl­pyridazin-3(2H)-one

In the title compound, C₁₇H₁₄N₂O₂, the central pyridazine ring forms dihedral angles of 47.29 (5) and 88.54 (5)° with the benzene rings, while the dihedral angle between the benzene rings is 62.68 (6)°. In the crystal, molecules are linked by two weak C—H...O hydrogen bonds and three weak C—H...π inter­actions.