作者:C.F. Wilcox、D. Hellwinkel、H. Stahl、H.G. Gaa、M. Dörner
DOI:10.1016/s0040-4039(00)80797-2
日期:1988.1
Relative to their neutral precursors, higly charged multi-tritylium ions show typical downfield 1H-NMR shifts, whereas the corresponding phenylfluorenylium ions show upfield shifts. A Hückel based model is presented that accounts for this contrasting behavior in terms of antiaromatic ring current in the five-membered ring of the fluorenyl system with essentially null ring currents in the two six-membered
相对于它们的中性前体,带高电荷的多三苯甲基离子显示出典型的低场1 H-NMR位移,而相应的苯基芴基离子显示出高场漂移。提出了一个基于Hückel的模型,该模型通过芴基系统五元环中的抗芳香环电流和两个六元环中的环电流基本为零的方式来解释这种对比行为。