Diethyl 2,4-Bis(o-chlorophenylhydrazono)-3-oxopentanedioate

Article abstract of DOI:10.1107/S0567740881004901

C21H20Cl2N4O5, M_r = 479.1, triclinic, a = 6.944(8), b = 16.062(11), c = 13.543(11) Angstroem, α = 124.4(1), β = 112.3(1), γ = 75.6(1) deg, U = 1152.3 Angstroem³, Z = 2, D_m = 1.37, D_c = 1.38 Mg m^-3, F(000) = 958, Mo Kα radiation, λ = 0.7107 Angstroem, μ = 0.325 mm^-1, space group P1 from the successful structure determination. 1475 independent reflections were refined to R 0.082.The two halves of the dimer (numbered A and B) are not coplanar and intersect at 68.8 deg.This allows hydrogen bonding from the N-H group to an ester oxygen in A and to a carbonyl oxygen in B.