Crystal structure of (E)-N-(4-bromophenyl)-2cyano-3-[3-(2-methylpropyl)-1-phenyl-1H-pyrazol- 4-yl]prop-2-enamide

The structure of the title compound, C23H21BrN4O, contains two independent molecules connected by hydrogen bonds of the type Namide-H center dot center dot center dot N equivalent to C to form a dimer. The configuration at the exocyclic C=C double bond is E. The molecules are roughly planar except for the isopropyl groups. There are minor differences in the orientations of these groups and the phenyl rings at N1. The dimers are further linked by 'weak' hydrogen bonds, two each of the types H-phenyl center dot center dot center dot O= C (H center dot center dot center dot O = 2.50, 2.51 angstrom) and H-phenyl center dot center dot center dot Br (H center dot center dot center dot Br = 2.89, 2.91 angstrom), to form ribbons parallel to the b and c axes, respectively. The studied crystal was a non-merohedral twin.