N′-[1-(2,4-Dioxo-3,4-dihydro-2H-1-benzopyran-3-ylidene)ethyl]thiophene-2-carbohydrazide

Abstract

The title compound, C16H12N2O4S, was obtained by the condensation of 3-acetyl-4-hydroxycoumarin with thien-2-ylcarbonyl hydrazide. The pyran ring adopts a 2,4-dione tautomeric form. The benzopyran ring system is almost coplanar with the thiophene ring [dihedral angle 0.9 (2)°]. The exocyclic C=C double bond has an E geometry. The molecular conformation is stabilized by an intramolecular N—H...O hydrogen bond. In the crystal, intermolecular N—H...O hydrogen bonds link the molecules into chains along the a axis.