Sanyucta Kumari

Crystal structure of 5-(furan-2-yl)-N-phenyl-1,3,4-oxa­diazol-2-amine

The title compound, C12H9N3O2, was obtained as a cyclized oxadiazole derivative from substituted thiosemicarbazide in the presence of manganese(II) acetate. The furan ring is disordered over two orientations, with occupancies of 0.76 (2) and 0.24 (2). The dihedral angles between the central oxadiazole ring and the pendant phenyl ring and furan ring (major disorder component) are 3.34 (18) and 5.7 (6)°, respectively. A short intramolecular C—H⋯O contact generates an S(6) ring. In the crystal, inversion dimers linked by pairs of N—H⋯N hydrogen bonds generate R 2 2[8] loops. The dimers are linked by C—H⋯π and π–π interactions [range of centroid–centroid distances = 3.291 (2)–3.460 (8) Å], generating a three-dimensional network.

Crystal structure of N′-[bis­(ethyl­sulfan­yl)methyl­idene]-2-hy­droxy-4-meth­oxy­benzohydrazide

In the title compound, C13H18N2O3S2, the amide group is in the plane of the benzoyl ring with a C—N—N—C torsion angle of 177.63 (12)°. The two dithioate groups are in an anti conformation [torsion angles = 173.68 (8) and −9.98 (10)°]. An intramolecular N—H⋯O hydrogen bond is observed. In the crystal, an O—H⋯O hydrogen bond and a weak C—H⋯O contact involving the same acceptor atom generate an S(6) ring motif and give rise to chains along [010].