There is a large contact term contribution to 13C paramagnetic shifts induced by Eu(dpm)3, Pr(dpm)3, and Eu(fod)3 in pyridine and β-picoline; this contribution may not be due mainly to spin delocalization through π-bonds.
M. Hirayama, E. Edagawa and Y. Hanyu, J. Chem. Soc., Chem. Commun., 1972, 1343 DOI: 10.1039/C39720001343
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