Phosphorus-31 and carbon-13 n.m.r. spectra have been obtained for three new tetra-alkyldiphosphines with bulky substituents: (ButPriP)2(1), (ButEtP)2(2), and (PriEtP)2(3). The spectra are assigned and the n.m.r. parameters are compared to those for anologuous compounds with lighter alkyl substituents. Molecular conformations are deduced and the effects of inversion at phosphorus discussed.
A. A. M. Ali, G. Bocelli, R. K. Harris and M. Fild, J. Chem. Soc., Dalton Trans., 1980, 638 DOI: 10.1039/DT9800000638
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