Hafner,K. et al., Angewandte Chemie, 1968, vol. 80, p. 801 - 802
作者:Hafner,K. et al.
DOI:——
日期:——
Hochauflösungs-13c-nmr-spektroskopie—III
作者:S. Braun、J. Kinkeldei
DOI:10.1016/0040-4020(77)80459-6
日期:1977.1
couplings of sterically unperturbated methyl groups in 7-membered rings are proportional to the corresponding 3JHH values which is indicative of comparable influences, but both types of vicinal couplings are not dependent on bondlengths only. Moreover they are to a large extent determined by the CCH bond angles θ and θ', which show a significant variation in condensed 7-membered rings so that this
已从未解耦的13 C NMR光谱确定了22个甲基取代的非本烯类多环共轭烃中环氢与甲基C原子(3 J CH 3 H)的邻域偶合,并已与键长以及相应的键长相关相邻的H,H偶合,部分来自自身的1 H NMR分析,部分来自文献。结果,在7元环中没有空间扰动的甲基的(3 J CH 3 H)偶联与相应的3 J HH成比例该值指示可比较的影响,但是两种类型的邻域耦合并不仅仅取决于键的长度。而且,它们在很大程度上由CCH键角θ和θ'决定,它们在缩合的7元环中显示出显着变化,因此在确定结构时必须考虑到这种双重依赖性。
Hafner,K. et al., Angewandte Chemie, 1976, vol. 88, p. 125 - 126