C-13 NMR-STUDIES ON 3-ARYL-4-CYANOSYDNONES (II) - NMR-SPECTROSCOPY AND THE CHAIN-CONJUGATED STRUCTURE OF SYDNONES

被引：4

作者：

WANG, SP ^{[1
]}

KUO, CN ^{[1
]}

MA, S ^{[1
]}

YEH, MY ^{[1
]}

机构：

[1] NATL CHENG KUNG UNIV,DEPT CHEM,TAINAN 70101,TAIWAN

来源：

SPECTROSCOPY LETTERS | 1993年 / 26卷 / 03期

关键词：

3-ARYL-4-CYANOSYDNONES; C-13; NMR; CHEMICAL SHIFT ANISOTROPY RELAXATION;

D O I：

10.1080/00387019308011542

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Carbon-13 NMR spectra of 3-aryl-4-cyanosydnones have been analyzed to serve as an electronic structure probe of sydnones. 2-Dimensional INADEQUATE experiments and spin-lattice relaxation time measurements were employed to ascertain exact assignments. Deshielding of the phenyl carbon para to the sydnone ring manifests that N(3) bears positive charge. The electronic-rich property of C(4) is confirmed by shift data of cyano carbons, which have been found by far the most shielded cyano carbons in nitrile-containing compounds yet reported. Shift variations of C(5) resulting from the substitution at C(4) and supplementary oxygen-17 chemical shift data provide evidence in favor of the chain-conjugated structure.

引用

页码：431 / 445

页数：15

共 40 条

[1]

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[2] CYCLIC MESO-IONIC COMPOUNDS .1. THE STRUCTURE OF THE SYDNONES AND RELATED COMPOUNDS [J].