Bibliographical noteFunding Information:
Acknowledgments. We are indebted to the U.S. National Institutes of Health for a research grant (No. H-2476), to Syntex S.A. (Mexico City) for a gift of 19-nor-A4-androstene-3,17-dione, to Prof. W.S. Johnson (University of Wisconsin) for providing some model ketols, to Dr. M. Ehrenstein (University of Pennsylvania) for a sample of l+hydroxytestosterone and to Prof. C. Djerassi (Stanford University) for the rotatory dispersion determinations.