C-13 CHEMICAL-SHIFT SENSITIVITY TO CHARGE IN DELOCALIZED CARBOCATIONS AND ITS RELATION TO RING CURRENT ANISOTROPY

被引：28
|
作者：
ELIASSON, B
JOHNELS, D
SETHSON, I
EDLUND, U
MULLEN, K
机构：
[1] UMEA UNIV,DEPT ORGAN CHEM,NMR RES GRP,S-90187 UMEA,SWEDEN
[2] UNIV MAINZ,DEPT ORGAN CHEM,W-6500 MAINZ,GERMANY
来源：
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2 | 1990年 / 06期
关键词：
D O I：
10.1039/p29900000897
中图分类号：
O62 [有机化学];
学科分类号：
070303 ; 081704 ;
摘要：
The total carbon shift changes that occur upon oxidation of a variety of delocalized hydrocarbons have been empirically separated into a charge term and a term related to ring current anisotropy. The largest low-field total shift is observed for the most paratropic di-cations, where the second term is the most significant one. The shielding contribution due to charge is considerably larger for di-cations than for the negatively charged species. Field and ion-pair effects are discussed in this context.
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页码：897 / 900
页数：4
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