Crystal Structure of 1,4-Dimethyl 2.5[2′-dispiroindane-1,3-dione]piperazine

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The title compound (C₂₂H₁₈N₂O₄) crystallizes in monoclinic space group P2₁/n with one-half molecule in the asymmetric unit. The complete molecule is generated by inversion symmetry. The structure was solved by direct methods and refined by full-matrix least-squares procedures to a final R = 0.046 and wR = 0.1187 using 2766 reflections. The piperazine and the cyclo-pentane rings adopt chair and envelope conformations, respectively. The molecular packing is stabilized by C-H…O and π…π interactions in addition to van der Walls forces.