13 C NMR method for determining the absolute configuration of secondary alcohols, is applied to five known steroids having a 1,2-glycol group composed of secondary and tertiary hydroxyl groups. The 1,2-alignment of the polar fucofuranosyl and tertiary hydroxyl group was found to have little influence on the requisite conformation of the glycosidic linkage. It showed the normal pattern of the distribution
摘要 岩藻
呋喃糖苷法是测定仲醇绝对构型的 13 C NMR 方法,适用于五种已知的具有由仲羟基和叔羟基组成的 1,2
-二醇基团的甾体。发现极性岩藻
呋喃糖基和叔羟基的 1,2-排列对糖苷键的必要构象几乎没有影响。它显示了 Δ δ C (和 Δ δ H )值分布的正常模式,如先前对简单单羟基衍
生物观察到的那样,证明了该方法对此类化合物的有用性。