The proton-decoupled 13C spectrum of 2-fluoronaphthalene has been reassigned and reveals a six-bond coupling of 2·8 Hz between the fluorine and C-6; a similar coupling is observed in 4-fluorostyrene; long-range 13C–19F coupling constants in other fluorinated aromatics appear to be related to variations in the π-bond orders in the bonds between the interacting spins.
D. Doddrell, D. Jordan, N. V. Riggs and P. R. Wells, J. Chem. Soc., Chem. Commun., 1972, 1158 DOI: 10.1039/C39720001158
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