title: Crystal structure of N'-[(1E)-1-(6-methyl-2,4-dioxo-3,4-di-hydro-2H-pyran-3-yl-idene)eth-yl]benzene-sulfono-hydrazide.
abstract: In the title compound, C14H14N2O5S, the mol-ecule exists in the enamine (C=C-NH) tautomeric form. The hydrazone fragment derived from the 3-acetyl-4-hy-droxy-6-methyl-2H-pyran-2-one moiety is approximately planar, with a maximum deviation of 0.1291 (11) Å for the N atom bound to the S atom of the benzensulfono-hydrazide group. The latter adopts a gauche conformation relative to the hydrazone N-N bond, with an N-N-S angle of 113.54 (10)°. There is an intra-molecular N-H⋯O=C hydrogen bond that stabilizes the tautomeric form. In the crystal, mol-ecules are linked by N-H⋯O=C hydrogen bonds into chains extending parallel to [100].
authors.affiliation: Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, Enugu State, Nigeria.
authors.forename: Jonnie N
authors.initials: JN
authors.lastname: Asegbeloyin
authors.affiliation: Department of Pure and Industrial Chemistry, University of Nigeria, Nsukka, Enugu State, Nigeria.
authors.forename: Oguejiofo T
authors.initials: OT
authors.lastname: Ujam
authors.affiliation: Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, PMB 5025, Awka, Anambra State, Nigeria.
authors.forename: Chizoba M
authors.initials: CM
authors.lastname: Ngige
authors.affiliation: Department of Pure and Industrial Chemistry, Nnamdi Azikiwe University, PMB 5025, Awka, Anambra State, Nigeria.
authors.forename: Valentine I
authors.initials: VI
authors.lastname: Onwukeme
authors.affiliation: School of Chemical Sciences, the University of Auckland Private Bag 92019, Auckland 1142, New Zealand.
authors.forename: Tania
authors.initials: T
authors.lastname: Groutso
keywords: benzene­sulfono­hydrazide; crystal structure; enamine tautomeric form; hydrazone; hydrogen bonds