STRUCTURE OF ETHYL 2-(3-METHYL-1,2,4-OXADIAZOL-5-YL)-2-PHENYLHYDRAZONETHANOATE

C13H14N4O3, M(r) = 274.3, orthorhombic, Pna2(1), a = 19.048 (6), b = 10.507 (4), c = 6.691 (4) angstrom, V = 1339.1 angstrom3, Z = 4, D(m) = 1.36 (flotation), D(x) = 1.360 Mg m-3, lambda(Mo Kalpha) = 0.7107 angstrom, mu = 0.933 cm-1, F(000) = 576, T = 298K, R = 0.0839, wR = 0.0643 for 773 observed reflections. The whole molecule is approximately planar, which can be seen from the values of the torsion angles about the non-rigid bonds; the molecular dimensions are in agreement with those found in analogous compounds. An important feature of the molecule is an intramolecular N-H...N hydrogen bond, which is characterized by an N...N distance of 2.66 (1) angstrom.