sulphur in 3β-acetoxy-(R)- and (S)-5α-methylsulphinylcholestane was also determined by an interpretation of intramolecular reactions involving the sulphoxide group. Two Cotton effects of opposite sign near 210 and 230 mµ occur in the o.r.d. spectra of the sulphoxides. Their relevance to chirality at sulphur and to restricted rotation about a C–S bond is discussed.
在手性
硫([R )-和(小号)-4β甲基亚磺酰基
5α-胆甾烷,(- [R )-和(小号)-5α-methylsulphinylcholestane,和3β乙酰氧基- ([R ) -和(小号)-5α-甲基亚磺酰基胆甾烷已通过热解法测定。碱催化的4β-亚砜氧化物差向异构化生成(R)-和(S)-4α-甲基亚磺酰基-
5α-胆甾烷。还通过解释涉及亚砜基团的分子内反应来确定3β-乙酰氧基-(R)-和(S)-5α-甲基亚磺酰基胆甾烷中
硫的手性。210和230 m µ附近的两个相反符号的棉花效应发生在亚砜的奥德谱中。讨论了它们与
硫的手性和与C–S键的受限旋转的相关性。