Hydrogenation of methyl linolenate. II. Studies on the structure of the isolinoleic acids

Summary The methyl isolinoleate fraction obtained by the low temperature crystallization procedure was found to be a mixture of at least three isomers, the 8,14‐, 9,15‐, and 10,14‐ isolinoleic acids. The infrared absorption spectrum of this fraction indicated a trans ‐configuration for at least one of the double bonds of isolinoleic acid. The Twitchell lead salt‐alcohol method was found unsuitable for the determination of saturated acids, due to the presence of a “solid isolinoleic” acid in the “solid” acids separated by this method.