The impact of ion pair association upon the 1H NMR spectra of cationic complexes akin to Grubbs catalysts.
A reconsideration of the (1)H NMR spectra of cationic transition metal complexes exhibiting the features of cyclophanes on the basis of Mislow's classification of topic groups arrives at the conclusion that the spectral changes triggered by chiral counterions reflect an intracationic diastereotopication of enantiotopic protons rather than the existence of pairs of long-lived diastereomeric ion pairs.
Otto-Diels-Institut für Organische Chemie der Universität, 24098 Kiel, Germany. schiemenz@ac.uni-kiel.de
Günter Paulus
GP
Schiemenz