Abstract
Abstract Lanthanide shift reagents have been used for diagnosis of s-trans and s-cis conformations of esters. By taking a ratio of lanthanide-induced shift of (H)CH2C=O protons vs. [shift reagent]/[substrate] as a reference, relative ratio of (H)CH2O- of the s-trans form has been found to be almost unity, whereas that of the s-cis ca. 0.5.
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