The fact that only compounds 1a, 1b and 2a in the series 1– 3 show long-range 13C–19F coupling can be used to draw conclusions regarding the structures of these molecules.
J. Chen, J. Reibenspies, A. Derecskei-Kovacs and K. Burgess, Chem. Commun., 1999, 2501 DOI: 10.1039/A907559C
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