5-(3-Nitrophenyl)-3-phenyl-4,5-dihydro-1H-pyrazole-1-carbaldehyde

A novel 1-formyl-2-pyrazoline was synthesized by reaction of an α,β- unsaturated ketone with hydrazine hydrate and formic acid. The structure of the title compound was established by UV, IR, 1H NMR, 13C NMR and microanalysis.