Accession Number : AD0763613

Title :   The Structure of a Ring-D-Bridged Steroid,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA OTTAWA (ONTARIO) DIV OF BIOLOGICAL SCIENCES

Personal Author(s) : Birnbaum,George I.

Report Date : 14 SEP 1972

Pagination or Media Count : 7

Abstract : 14ALPHA,17ALPHA-Etheno-15,16-di(trifluoromethyl)-4,15-pregnadiene-3,20-dione, C25H26O2F6, crystallizes in the orthorhombic space group. Intensity data were collected at room temperature with an automatic four-circle diffractometer. The structure was solved by direct methods and refined by the least-squares procedure to a final value of R=0.061 for 2369 observed reflexions. The confirmation of ring A is intermediate between a half-chair and a sofa. Rings B and C, which are trans fused, are chair shaped. The geometry of the bicyclic system consisting of rings D and D* is very similar to that or norbornadiene. (Modified author abstract)

Descriptors :   (*STEROIDS, *MOLECULAR STRUCTURE), (*CRYSTAL STRUCTURE, STEROIDS), HALOGENATED HYDROCARBONS, FLUORINE COMPOUNDS, CHEMICAL BONDS, CANADA

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE