The determination of conjugated<i>cis‐trans</i> and<i>trans‐trans</i> methyl octadecadienoates by infrared spectrometry

Abstract

Summary Pure conjugated methyl cis‐trans and trans‐trans octadecadienoates have been prepared and used to develop a method for the determination of these compounds by infrared spectrometry. Cis‐trans compounds alone or in the presence of trans‐trans conjugation may be determined directly by the absorption at 10.55 μ. In the absence of cis‐trans isomers conjugated trans‐trans octadienoates may be determined directly from the absorption at 10.11 μ. When both types of compounds are present however, a correction must be applied for the contribution of the cis‐trans isomers to the 10.11 μ absorption of the trans‐trans material.