Carbon-13 chemical shift tensors in aromatic compounds. 4. Substituted naphthalenes
作者:Anita M. Orendt、Naresh K. Sethi、Julio C. Facelli、W. James Horton、Ronald J. Pugmire、David M. Grant
DOI:10.1021/ja00034a012
日期:1992.4
theory and experiment is obtained. The chemical shift principal values and orientations of these substituted napthalenes correspond to those found in napthalene; the observed differences can be rationalized in terms of the strain introduced by the alkyl substituent. In the napthalenic derivatives studied; the bridgehead carbons exhibit relatively extensive pi}-electron delocalization not found in some
sup 13}C 化学位移张量的主要值是使用可变角度测量 1,4,5,8-四甲基萘、1,2,3,6,7,8-六氢芘和并苯的芳香碳纺纱技术。还报告了完整屏蔽张量的从头算计算,并提供了分子框架中主要值的方向。获得了理论和实验之间的良好一致性。这些取代萘的化学位移主值和方向与在萘中发现的一致;观察到的差异可以根据烷基取代基引入的应变来合理化。在研究的萘衍生物中;桥头碳表现出相对广泛的pi}-电子离域,在更高度稠合的芳烃系统中的一些桥头中没有发现。