STRUCTURE OF THE 4-OXO-2-BUTENOIC ACID ALKYL ESTER MOIETY .3. STRUCTURES OF DIETHYL N,N'-(ETHYLENEDIAMINO)BIS(4-OXO-2-BUTENOATE) AND PROPYL 4-OXO-4-UREIDO-2-BUTENOATE

(5), C14H20N2O6, M(r) = 312.3, monoclinic, P2(1)/c, a = 11.348 (1), b = 4.854 (1), c = 14.629 (1) angstrom, beta = 99.87 (1)-degrees, V = 793.9 angstrom3, Z = 2, D(x) = 1.306 Mg m-3, lambda(Cu K-alpha) = 1.54178 angstrom, Ni filter, mu = 0.83 mm-1, F(000) = 332, T = 293 K, R = 0.047 for 755 reflections. (6), C8H12N2O4, M(r) = 200.2, orthorhombic, Pccn, a = 39.365 (2), b = 10.147 (1), c = 9.937 (1) angstrom, V = 3968.9 angstrom3, Z = 16, D(x) = 1.340 Mg m-3, lambda(Cu K-alpha) = 1.54178 angstrom, Ni filter, mu = 0.93 mm-1, F(000) = 1696, T = 293 K, R = 0.043 for 2119 reflections. The conjugated 4-amino-4-oxo-2-butenoate fragments are approximately planar, with the ester group anti to the double bond. Amide type NH...O hydrogen bonds join molecules into chains in the first structure. Crystals of the urea derivative contain a complex hydrogen-bonding network which includes an intramolecular hydrogen bond.