Lanthanide Chemical Shift Reagents as Tools for Determining Isomer Distributions in 2,4-Hexadieneoates and Related Compounds, Organic Magnetic Resonance, Vol. 6, p250, (1974).
The isomer distributions in Me sorbate, 2,4-hexadienol, PhCH:CHCOMe and Me cinnamate were detd. from their NMR spectra with Eu(fod)3 (fod= 1,1,1,2,2,3,3-heptafluoro-7,7-dimethyl-4,6-octanedionato). The method was est. to detect the presence of ~2% of a cis isomer