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.

引用

页码：897 / 900

页数：4

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[2]

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