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Determination of aromaticity indices of thiophene and furan by nuclear magnetic resonance spectroscopic analysis of their phenyl esters

✍ Scribed by Chang Kiu Lee; Ji Sook Yu; Hye-Jin Lee

Publisher
Journal of Heterocyclic Chemistry
Year
2002
Tongue
English
Weight
69 KB
Volume
39
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

A series of m‐ and p‐substituted phenyl benzoates, 2‐thienoates, and 2‐furoates were prepared and their ^1^H and ^13^C nmr spectroscopic characteristics were examined. In general, good correlations were observed between the chemical shift values of protons and carbons of the acyl aromatic rings and the Hammett σ. Plots of the chemical shift values of the carbonyl carbons of the benzoates against those of the 2‐thienoates and 2‐furoates gave an excellent correlation and the values of the slopes are 0.85 and 0.75, respectively, in dimethyl sulfoxide‐d~6~ and 0.90 and 0.78, respectively, in chloroform‐d. The values could be considered as a set of aromaticity indices.

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