Acta Cryst. (2003). E59, o272-o274  [ doi:10.1107/S1600536803002423 ]

4-[(2,6-Dichlorophenyl)(hydroxyimino)methyl]-1,5-dimethyl-2-phenyl-1,2-dihydropyrazol-3-one

X.-F. Li, Y.-Q. Feng, J.-P. Zhuang and X.-F. Hu

Abstract: The title compound, C₁₈H₁₅Cl₂N₃O₂, was derived from the product of the intermolecular [3  +  2]-cycloaddition reaction of 2,6-dichlorobenzonitrile oxide and 1,5-dimethyl-2-phenyl-1,2-dihydropyrazol-3-one. The hydroxy group and the 2,6-dichlorophenyl ring of the oxime are in a trans conformation and the C=N-O angle is 113.90  (15)  Å. Pairs of molecules form centrosymmetric O-HN hydrogen-bonded dimers, with an ON distance of 2.821  (2)  Å. The pyrazole ring is nearly planar, with a mean deviation from the plane of 0.0246  (3)  Å and a dihedral angle between the pyrazole and the unsubstituted phenyl ring of 131.7  (4)°.

Online 7 February 2003

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