Abstract
Spectroscopic evidence has been obtained to indicate that a double bond acid which resists conjugation on alkali isomerization is produced on the partial hydrogenation of methyl linoleate. This iso-acid is found in methyl linoleate subjected to hydrogenation at room temperature, atmospheric pressure, using a supported palladium black catalyst. The acid may be identical with that which arises from a preferential hydrogenation of 9,12,15-linolenic acid. Soybean oil hydrogenated under similar conditions contains an iso-diene acid that resists conjugation by alkali. The source of this acid has not been determined. Lead salt separations of soybean oil fatty acids and low temperature solvent crystallization of soybean oil fatty acids and glycerides resulted in some concentration of the iso-acid. Further work involving bromination and/or oxidation of these concentrates is necessary before the structure of the iso-acid can be established with certainty.
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