Acta Cryst. (2007). E63, o36-o37  [ doi:10.1107/S1600536806051014 ]

4-[(1E)-(2-Hydroxy-5-nitrophenyl)methyleneamino]-1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one

D.-B. Chen and L. Huang

Abstract: The title compound, C₁₈H₁₆N₄O₄, has been synthesized by condensation of 5-nitrosalicylaldehyde and 4-aminoantipyrine. There are two molecules in the asymmetric unit. The crystal structure shows a strong intramolecular O-HN hydrogen bond, which leads to the existence of a phenol-imine tautomer.

Online 6 December 2006

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