were prepared from the 20‐keto compounds by Wittig reaction or a modified Simmons‐Smith reaction. The 13C NMR spectra of these steroids and of 3‐methylene derivatives are analysed. Solvent effects produced by addition of methanol‐d4 in the spectra of the 20‐methylene steroids are correlated with intramolecular hydrogen bonding in the corresponding 20‐ketosteroids.
20-Methylpregna-4,20-dien-3-one 和相应的 17α-羟基、20-羟甲基和 17α-羟基-20-羟甲基衍
生物是通过 Wittig 反应或改良的 Simmons-Smith 反应从 20-酮化合物制备的. 分析了这些类
固醇和 3-亚甲基衍
生物的 13C NMR 光谱。在 20-亚甲基类
固醇的光谱中添加
甲醇-d4 产生的溶剂效应与相应的 20-
酮类固醇中的分子内氢键相关。