Contact contributions can be significant to the Eu(dpm)3– and Pr(dpm)3-induced shifts of α-carbon atoms in the 13C n.m.r. spectra of ketones: Yb(dpm)3 is an excellent shift reagent for 13C n.m.r. structural studies.
D. J. Chadwick and D. H. Williams, J. Chem. Soc., Chem. Commun., 1974, 128 DOI: 10.1039/C39740000128
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