4-(5-Oxo-3-phenyl-4,5-dihydro-1H-pyrazol-1-yl)benzenesulfonamide

Abstract

With respect to the aliphatic planar fivemembered ring (r.m.s. deviation = 0.011 Å) of the title compound, C 15H 13N 3O 2S, the phenyl ring is aligned at 6.9 (1)° and the phenylene ring at 2.4 (1)°, so that the three rings are nearly coplanar. The amino group has the N atom in a pyramidal geometry; the group is a hydrogenbond donor to the sulfonyl O atom of one molecule and to the ketonic O atom of another molecule, resulting in the formation of a layer parallel to the bc plane.