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The NMR spectra of fluoroaromatics—IV:1H and 19F spectra of some fluorinated benzofurans

✍ Scribed by R. J. Abraham; D. F. Wileman; G. R. Bedford; D. Greatbanks

Publisher
John Wiley and Sons
Year
1972
Tongue
English
Weight
520 KB
Volume
4
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The complete analyses of the ^19^F spectra of some fluorinated benzofurans are given. These provide an unambiguous determination of the substituent position in these compounds. Comparison of the ^19^F SCS and coupling constants in the benzofuran, benzothiophene and benzene series shows that ^19^F spectral parameters can be transposed from the benzene series with caution.

A large increase in the para FF coupling with ring closure of the hetero‐ring is noteworthy. A long‐range through‐space ^8^J~H~ is reported which arises from the proximity of the 3 carboethoxy methyl group and the C~4~ fluorine in these molecules.

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