The 1,5-, 1,6-, 2,7-, and 2,6-isomers of bis(diethoxyphosphinoylmethyl)naphthalene show interbenzylic 31P–31P spin coupling constants over seven, eight, and nine bonds, respectively, which are primarily determined by π-electron contributions.
L. Ernst, J. Chem. Soc., Chem. Commun., 1977, 375 DOI: 10.1039/C39770000375
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