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Nitrogen-15 nuclear magnetic resonance spectroscopy. 15N19F coupling constants in fluoropyridines and fluoroanilines

✍ Scribed by Mukund P. Sibi; Robert L. Lichter

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
298 KB
Volume
14
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Two‐to five‐bond ^15^N^19^F coupling constants have been determined for fluoropyridines, 8‐fluoroquinoline, fluoroanilines and fluoroaniline derivatives. Only in 2‐fluoropyridine is J(NF) large, and this is associated with a lone pair mediated enhancement of the coupling. Values in fluoroanilines and derivatives are <2Hz. Except for the fluoroanilines themselves, J(NF) decreases inversely with the number of intervening bonds. In the anilines, only ^5^J(NF) is observable. Possible influences of lone pair interaction and hydrogen bonding are discussed.

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