title: 4-Benzyl-6-p-tolyl-pyridazin-3(2H)-one.
abstract: The title compound, C(18)H(16)N(2)O, is a new dihydro-pyridazin-3(2H)-one derivative synthesized in one step by condensation of α-benzyl-idene-γ-tolyl-butenolide with hydrazine. The mol-ecule is not planar; the tolyl and pyridazine rings are twisted with respect to each other making a dihedral angle of 27.35 (9)° and the benzyl ring is nearly perpendicular to the pyridazine ring with a dihedral angle of 85.24 (5)°. In the crystal structure, inversion dimers arise, being linked by pairs of N-H⋯O hydrogen bonds. Weak C-H⋯O hydrogen bonds and weak offset π-π stacking stabilize the packing. The π-π stacking occurs between the pyridazine rings of symmetry-related mol-ecules, with a centroid-centroid distance of 3.748 Å, an inter-planar distance of 3.605 Å and a slippage of 1.024 Å.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Oubair
authors.forename: Jean-Claude
authors.initials: JC
authors.lastname: Daran
authors.forename: Rachid
authors.initials: R
authors.lastname: Fihi
authors.forename: Lhou
authors.initials: L
authors.lastname: Majidi
authors.forename: Mohamed
authors.initials: M
authors.lastname: Azrour