(E)-3,5-Dimethyl-1-p-tolyl-4-(p-tolyldiazenyl)-1H-pyrazole

There are two independent molecules, A and B, in the asymmetric unit of the title compound, C19H20N4, in each of which the N=N double bond has an E conformation. The dihedral angles between the pyrazole ring and the p-tolyl rings in the 1- and 4-positions are 22.54 (8) and 35.73 (7)degrees, respectively, in molecule A. The corresponding dihedral angles in molecule B are 28.13 (8) and 22.18 (8)degrees. In the crystal, the A and B molecules are linked by weak C-H center dot center dot center dot pi interactions, leading to inversion dimers in each case.Fondo Nacional de Desarrollo Cientifico y Tecnologico (FONDECYT) 11100446 1080269 Universidad Andres Bello DI-06-10-