The magnitude and sign of 2J(15N–19F)(–52·64 Hz) in 2-fluoropyridine is determined from natural abundance proton-coupled 15N Fourier transform n.m.r. spectra using selective population transfer; a lone-pair effect or ‘through-space’ coupling dominates the 2J(15N–19F) spin coupling mechanism.
H. J. Jakobsen and W. S. Brey, J. Chem. Soc., Chem. Commun., 1979, 478 DOI: 10.1039/C39790000478
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