Studies in the steroid group. Part LXXX. Proton magnetic resonance and mass spectra of 2-aza-3-oxo-, 3-aza-2-oxo, 16-aza-17-oxo-, and 17-aza-16-oxo-5α-androstane

Abstract

Spectrometric examination established the structures of the steroids named in the title. In the mass spectrum of one of the ring-D-lactams (the 17-aza-16-oxo-isomer) the base peak arises from the (M– 15) ion, and no other peak has an abundance of more than 8%. Distinction between the ring-A lactams depends upon differentiation, by ¹H n.m.r., between the units [graphic omitted]CH·CH₂·CO·NH·CH₂– and [graphic omitted]CH·CH₂·NH·CO·CH₂–.