Synthesis and Crystal Structure of 3,3-Dimethyl-7,11-di(thiophene-2-yl)-2,4-dioxyspiro5. 5undecane-1,5,9-trione

摘要

The title compound (C19H18O5S2) has been synthesized by the reaction of thiophene-2-carboxaldehyde, isopropylidene malonate and 4-chloroaniline using [bmim]Br as solvent,and characterized by IR,1H NMR and X-ray single-crystal diffraction. The crystal belongs to monoclinic, space group P21 with a = 9.4872(15), b = 9.5148(13), c = 20.634(3)(A),β=92.209(2)°,(V) = 1861.2(4)(A)3, Mr= 390.45, Z = 4, Dc = 1.393 g/cm3,μ(MoKα) = 0.313 mm-1, F(000)=816, the final R = 0.0685 and wR = 0.1685. X-ray analysis reveals that two six-membered rings adopt chair and planar conformations, respectively.