4,5‐Di­hydro‐3‐methyl‐5‐(4‐methyl­phenyl)‐1H‐pyrazole‐1‐carbox­amide

The reaction between 4‐(4‐methyl­phenyl)­but‐3‐en‐2‐one and amino­guanidine produced an unexpected product of formula C₁₂H₁₅N₃O, consisting of a carbox­amide moiety joined to a substituted pyrazoline ring at one of the N atoms. The pyrazoline ring adopts a flat‐envelope conformation and the substituted phenyl ring is oriented almost perpendicular to the heterocycle. The carbonyl O atom has partial anionic character as a result of the transfer of π density from the two adjacent sp² N atoms and is involved in an intermolecular hydrogen bond with the amide group.