PMR‐spectra of some diastereoisomeric ionol isomers in the presence of EUIII‐2,2,6,6‐tetramethylheptadionate

PMR-spectra of diastereoisomers containing two chiral centres can be elucidated by complexation with the EuIII-heptadionate shift reagent, as is illustrated for the two pairs of diastereoisomers of both (E)-α-ionol (I) and the bicyclic ionol II.