Coupling constants display a reversal of sign in acetylenic phosphines, 1JP–C < 0, 2JP–C > 0, 3JP–H < 0; they are positive in acetylenic phosphine oxides and their values suggest dominance by the Fermi contact interaction.
R. Lequan, M. Pouet and M. Simonnin, J. Chem. Soc., Chem. Commun., 1974, 475 DOI: 10.1039/C39740000475
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