Abstract
The use of the deuterated shift reagent, Eu(FOD) 3-d 30, has enabled an identification to be made of the 8- to 12-isomers of methyl trans-octadecenoate from PMR measurements at 100 or 220 MHz. The δ-values observed were in good agreement with those calculated from a method employing the lanthanide-induced shifts (LIS) in methyl stearate and the deshielding effects of the double bond. Use was made of the δ-value of the methyl ester absorption as an internal reference to allow corrections to be made for changes in measuring conditions. It is concluded that all positional isomers of both cis and trans methyl octadecenoates may be identified by this method.
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