Comparative studies of the effects of lanthanide and actinide dipivalomethanate (DPM) chelates on the 14N n.m.r. spectrum of pyridine show that Dy(DPM)3 is by far the best high-field shift reagent for 14N whilst Yb (DPM)3 is the best low-field shift reagent.
M. Witanowski, L. Stefaniak, H. Januszewski and Z. W. Wolkowski, J. Chem. Soc. D, 1971, 1573 DOI: 10.1039/C29710001573
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