Abstract
The title compound crystallizes in the monoclinic system, space groupC2/c, witha=21.526(2),b=6.096(2),c=25.958(1),β=97.29(2) andZ=8. The structure was solved by direct methods and refined by full-matrix least-squares, givingR=0.054 for 2309 unique observed reflections. The 4-piperidone ring has a slightly distorted chair conformation with a mean torsion angle of 55.3(2)°; the puckering is enhanced around N1 and decreased around C4. A comparative study of the geometry of 4-piperidone rings in 13 compounds is also reported. The 4-piperidone ring exists in a distorted chair form in seven compounds while in the remaining six it is in the distorted sofa form.
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