Abstract
A crystallographic comparison comprised of some geometrical and structural features of a steroids series (pregnane derivatives) is made in the present paper. Some selected bond distances and bond angles of interest are discussed in detail. Conformations of individual ring systems in a series of 46 pregnane derivatives have been calculated and discussed. Correlation of ring conformations especially the rarer ones, vis-a-vis the multiple bonds and ring junctions has been discussed. Graphical presentations of ring conformations are made for all the five- and six-membered rings to show the relative frequency of their occurrence. 17β-side chain conformation is discussed in some pregn-20-one structures. X–H···A intra- and intermolecular interactions in the identified derivatives have been discussed with the standard distance and angle cut-off criteria. Distance-angle scatter plots for both kinds of interactions are presented for a better understanding of the packing interactions which exist in pregnane molecules.
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