1-{3-[(4-Oxopiperidin-1-yl)carbonyl]benzoyl}piperidin-4-one (original) (raw)
2010, Acta Crystallographica Section E Structure Reports Online
Two independent molecules comprise the asymmetric unit in the title compound, C 18 H 20 N 2 O 4. One of the molecules exhibits disorder in one of its 4-piperidone rings, which is disposed over two orientations [site occupancy of the major component = 0.651 (5)]. The first independent molecule and the minor component of the second disordered molecule are virtually superimposable. The central four C atoms in the major component of the disordered molecule have an opposite orientation. All the 4-piperidone rings have a chair conformation. The carbonyl groups in each molecule have approximate anti conformations [O CÁ Á ÁC O = 146.2 (2) and À159.9 (2) ]. The 4-piperidone rings lie to opposite sides of the central benzene ring in both molecules. In the crystal, molecules are linked by C-HÁ Á ÁO interactions. The crystal studied was found to be a non-merohedral twin (twin law À1 0 0, 0 1 0, 0 À 1/2 À 1), the fractional contribution of the minor component being approximately 11%. VV is grateful to the DST-India for funding through the Young Scientist Scheme (Fast Track Proposal). Supplementary data and figures for this paper are available from the IUCr electronic archives (Reference: HB5532). organic compounds o1988 Rajesh et al.
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