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Published in last 50 years
The cations of the iminium salts (1)–(3) show characteristic 1H n.m.r. shifts induced by Eu(fod)3; (+)-Eu(hfbc)3 generates unequal shifts for enantiotopic groups in the cations of (3) and (5).
Determination of Rate of Internal Rotation by <sup>1</sup>H‐NMR Spectroscopy in the Presence of Optically Active Auxiliary Compounds