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N'-[1-(2,4-Dioxo-3,4-dihydro-2H-1-benzopyran-3-yl-idene)eth-yl]thiophene-2-carbo-hydrazide.

ABSTRACT: The title compound, C(16)H(12)N(2)O(4)S, was obtained by the condensation of 3-acetyl-4-hy-droxy-coumarin with thien-2-ylcarbonyl hydrazide. The pyran ring adopts a 2,4-dione tautomeric form. The benzopyran ring system is almost coplanar with the thio-phene ring [dihedral angle 0.9?(2)°]. The exocyclic C=C double bond has an E geometry. The mol-ecular conformation is stabilized by an intra-molecular N-H?O hydrogen bond. In the crystal, inter-molecular N-H?O hydrogen bonds link the mol-ecules into chains along the a axis.

SUBMITTER: Helliwell M

PROVIDER: S-EPMC3099777 | biostudies-literature | 2011 Apr

REPOSITORIES: biostudies-literature

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N'-[1-(2,4-Dioxo-3,4-dihydro-2H-1-benzopyran-3-yl-idene)eth-yl]thiophene-2-carbo-hydrazide.

Helliwell Madeleine M Nasiopoulou Despina A DA Harris Philip A PA Kotali Antigoni A Joule John A JA

Acta crystallographica. Section E, Structure reports online 20110331 Pt 4

The title compound, C(16)H(12)N(2)O(4)S, was obtained by the condensation of 3-acetyl-4-hy-droxy-coumarin with thien-2-ylcarbonyl hydrazide. The pyran ring adopts a 2,4-dione tautomeric form. The benzopyran ring system is almost coplanar with the thio-phene ring [dihedral angle 0.9 (2)°]. The exocyclic C=C double bond has an E geometry. The mol-ecular conformation is stabilized by an intra-molecular N-H⋯O hydrogen bond. In the crystal, inter-molecular N-H⋯O hydrogen bonds link the mol-ecules int ...[more]

PMID: 21754031

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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.

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