%0 Journal Article
%T N′-[1-(2,4-Dioxo-3,4-dihydro-2H-1-benzopyran-3-ylidene)ethyl]thiophene-2-carbohydrazide
%A Madeleine Helliwell
%A Despina A. Nasiopoulou
%A Philip A. Harris
%A Antigoni Kotali
%J Acta Crystallographica Section E
%D 2011
%I International Union of Crystallography
%R 10.1107/s1600536811010907
%X 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)¡ã]. The exocyclic C=C double bond has an E geometry. The molecular conformation is stabilized by an intramolecular N¡ªH...O hydrogen bond. In the crystal, intermolecular N¡ªH...O hydrogen bonds link the molecules into chains along the a axis.
%U http://scripts.iucr.org/cgi-bin/paper?S1600536811010907