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NMR properties of 1,8-diphosphanaphthalenes with prerequisites for strong through-space interaction were studied. The exceptional magnitude of 4J(PP) 246 Hz was found in Nap[P(NMe2)2][P(OMe)(NMe2)] (Nap = naphthalene-1,8-diyl). The PIII, PV mixed valence systems Nap[P(E)(OMe)2][P(OMe)2] (E = O, S, Se) show much lower magnitudes of through-space interaction than expected.
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Kilián et al. (2004) studied this question.
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