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α-山道年(Ⅰ)分子中各不对称碳原子的絕对构型,除C_(11)甲基外,早巳根据其本身及变貭山道年(Ⅳ和Ⅴ)的相对构型、以及其一类物的降解体与絕对构型巳知的甾体降解物相同的事实,获得公认为正确的推定。关于C_(11)甲基絕对构型的研究近年来也有若干工作,不过在推論方面尚有不同的意見。Woodward等,Corey以及Cocker等根据α-变貭山道年(Ⅳ)在酸性介貭中比β-变貭山道年(Ⅴ)不稳定的事实,均分
The absolute configuration of each asymmetric carbon atom in α-Hill Road (Ⅰ), except for the C_ (11) methyl group, has been based on the relative configuration of itself and on the change of Jundianshan years (Ⅳ and Ⅴ) The fact that the degradation products of one class of them are the same as the known steroid degradation products of absolute configuration has been accepted as the correct presumption. In recent years, there have been a few studies on the absolute configuration of C_ (11) methyl, but there are still different opinions on the reasoning of C_ (11) methyl. Woodward et al., Corey et al., Cocker et al., Based on the fact that α-貭 貭 Shan years (Ⅳ) are more unstable than β-貭 貭 貭 years (Ⅴ) in acid medium,