cis- and trans-isomers of 2,2,3,4,4-pentamethyl-phosphetan oxides can be distinguished by the paramagnetic shifts of the respective 3-protons in their n.m.r. spectra in the presence of tris(dipivalomethanato) europium(III), Eu(DPM)3.
J. R. Corfield and S. Trippett, J. Chem. Soc. D, 1971, 721 DOI: 10.1039/C29710000721
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