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A 13C{1H} double resonance study of the signs of 1H19F and 13C19F spin coupling constants in fluorobenzenes and 2-fluoropyridine

✍ Scribed by W. S. Brey; L. W. Jaques; H. J. Jakobsen

Publisher
John Wiley and Sons
Year
1979
Tongue
English
Weight
397 KB
Volume
12
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The signs of all ^13^C^19^F and ^1^H–^19^F coupling constants in fluorobenzene, some substituted derivatives, and in 2‐fluoropyridine have been related using single‐frequency ^13^C{^1^H} double resonance techniques. All ^13^C^19^F couplings in these compounds are shown to be positive. Direct experimental proof is given for a positive sign for the small five‐bond ^1^H^19^F coupling constant (=0.2—0.3 Hz) in fluorobenzene. The positive sign for ^4^J(C‐4, F) in fluorobenzene is in accord with a positive π‐electron contribution to this coupling.

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