作者:Reinhard W. Hoffmann、Dirk Stenkamp、Thomas Trieselmann、Richard Göttlich
DOI:10.1002/(sici)1099-0690(199911)1999:11<2915::aid-ejoc2915>3.0.co;2-r
日期:1999.11
only two conformations. Substituents have been varied in order to find those which lead to a strong preference of the conformer equilibrium. Studying 2-substituted 4-methylpentanes 3 and 4-benzyloxypentanes 12, it has been shown that substituent effects on the conformer equilibria are not additive, as would be expected on the grounds of steric effects alone. Rather, interactions between polar groups
2,4-二取代戊烷是基本上仅采用两种构象的分子。为了找到导致构象异构体平衡的强烈偏好的取代基,已经改变了取代基。研究 2-取代的 4-甲基戊烷 3 和 4-苄氧基戊烷 12,已经表明取代基对构象异构体平衡的影响不是相加的,正如仅基于空间效应所预期的那样。相反,极性基团之间的相互作用加强了构象异构体平衡的偏差。当应用于 2,4-二取代戊烷时,氯或邻苯二甲酰亚胺等取代基将构象异构体平衡移动到 gg 构象异构体一侧,优先级超过 90%。