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13C NMR study of some derivatives of 1,3,4-oxadiazoles, 1,3,4-thiadiazoles and isosydnones

✍ Scribed by Gérard Aranda; Michèle Dessolin; Michel Golfier; Marie-George Guillerez

Publisher
John Wiley and Sons
Year
1982
Tongue
English
Weight
493 KB
Volume
18
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The assignment of all ring carbons of 37 derivatives of 1,3,4‐oxa‐ or thiadiazoles and of seven isosydnones is described. In some cases, ^13^C‐labelled compounds were used. The analysis of substituent effects and the calculation of charge densities of some of the derivatives suggest that the two nitrogen atoms form a protective screen against electron perturbation and play the role of an ‘electronic buffer’. A notable variation of chemical shifts could be observed only when oxygen is replaced by sulphur.

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