On the formation of allenes in the steroid series II. Synthesis and structure of several 19‐nor‐17,20‐pregnadienes

Abstract

Abstract A number of 19‐nor‐pregnane derivatives bearing a 17,20‐diene side‐chain has been synthesized; the stereochemistry of the products formed during the preparation of non‐substituted, mono‐ and dimethyl allenes has been studied by means of application of Brewster's Rules and NMR spectroscopy.