Abstract
The crystal structure of 18-cyanoprogesterone was determined by X-ray diffraction methods:P212121a=7.436(2),b=11.322(2),c=22.642(2) A. The structure was solved usingShelx-86. Final conventionalR=0.054.Rw=0.051 for 1841 reflections. TheA ring has an intermediate sofa-half-chair conformation with asymmetry parameters ΔCs/1=11.0, ΔC23,4=14.9. The steroid skeleton exhibits a flattening of theA ring relative to the rest of the molecule. The progesterone side chain has a typical conformation, and the C16-C17-C20-O20 torsion angle is −19.0(6)°.
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