A carbon-13 nuclear magnetic resonance study of the 1,4-diene analogues of steroid hormones and related steroids

The ¹³C NMR spectra of sixteen 4-ene-3-keto- and 1,4-diene-3-keto corticosteroids are described. Substituent shifts and the effect of added methanol-d₄ are reported, and conformational distortions and intramolecular hydrogen bonding are analysed based on these data.