The isomeric (Z)- and (E)-3-ethylidene-5α-cholestanes have been synthesized, and their c.d. curves determined. The chiral unit of structure represented by a conformationally rigid ethylidenecyclohexane unit (XIVa or b) makes a major contribution to the c.d. of these and some other olefinic steroids.
已经合成了异构体(Z)-和(E)-3-亚乙基-
5α-胆甾烷,并确定了它们的cd曲线。由构象刚性的
亚乙基环己烷单元(XIVa或b)表示的结构的手性单元对这些和一些其他烯烃类
固醇的cd有重要贡献。