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) Å. The structure was solved using Shelx-86. Final conventional R=0.054. Rw=0.051 for 1841 reflections. The A ring has an intermediate sofa-half-chair conformation with asymmetry parameters ΔCs /1=11.0, ΔC2 3,4=14.9. The steroid skeleton exhibits a flattening of the A 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)°.
|Original language||English (US)|
|Number of pages||4|
|Journal||Journal of Crystallographic and Spectroscopic Research|
|State||Published - Oct 1 1990|
ASJC Scopus subject areas
- Structural Biology
- Condensed Matter Physics