A-Ring conformations in B-nor-5α-cholestane-3β, 6α-diol (IV), the 3β-monoacetate (II), the 3, 6-dione (VI), 3β-acetoxy-B-nor-5α-and-5β-cholestan-6-one (III, XVIII) and 3β-hydroxy-B-nor-5β-cholestan-6-one (XVII) were discussed on the basis of evidence obtained from nuclear magnetic resonance spectra and conformational analysis.
B-nor-
5α-胆甾烷-3β、6α
-二醇 (IV)、3β-单
乙酸酯 (II)、3, 6-二酮 (VI)、3β-乙酰氧基-B-nor-5α- 中的 A 环构象和-5β-胆甾烷-6-酮(III,XVIII)和3β-羟基-B-正-5β-胆甾烷-6-酮(XVII)根据核磁共振谱和构象分析获得的证据进行了讨论。