research papers
A crystallographic comparison comprised of some geometrical and structural features for a series of steroids (cholestane derivatives) is made in the present paper. Selected bond distances and bond angles of interest are discussed in detail. Conformations of individual ring systems in a series of 28 cholestane derivatives are calculated and discussed. Graphical presentations of ring conformations are made for all the five- and six-membered rings to show the frequency of their occurrence. X—HA intra- and intermolecular interactions in the identified molecules are discussed with the standard distance and angle cut-off criteria. Distance–angle scatter plots for both kinds of interactions are presented for better understanding of packing interactions existing in cholestane molecules.
Supporting information
Portable Document Format (PDF) file https://doi.org/10.1107/S0108767305031041/xo5005sup1.pdf |