This empirical analysis of CD data for 7-membered lactams includes examples of all twelve possible structural types in which the lactam is fused to a cyclohexane ring as part of a polycyclic compound. The CD behaviour of several classes of lactams shows ‘dOgura's sign rule’ to be an over-simplification. The signs and values of Δϵ for lactams in which the second ring is fused at the 3,4- or 6,7-positions
对7元内酰胺的CD数据进行的经验分析包括所有十二种可能的结构类型的示例,其中内酰胺作为
多环化合物的一部分与
环己烷环稠合。几类内酰胺的CD行为表明“ dOgura的符号规则”过于简单。第二个环在内酰胺环的3,4-或6,7位稠合的内酰胺的Δϵ的符号和值显示出与4,5-或5,6-的“正常”值相差很大融合内酰胺。