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It is well known that, when an unsaturated higher fatty acid ester (such as methyl linoleate or linolenate) is hydrogenated, the process is largely selective, and no fully-saturated ester is produced until nearly 90 per cent, of the polyethylenic ester has been transformed into monoethylenic compounds (i. e ., methyl oleate and iso-oleates). Accordingly, if the monoethylenic esters produced by selective hydrogenation of, for example, methyl linolenate. CH3 . CH2 . CH : CH . CH2 . CH : CH. CH2 . CH : CH. [CH2 ]7 . COOMe were a mixture of the esters of Δ9 : 10 -, Δ12 : 13 -, and Δ15 : 16 -octadecenoic acids in more or less equivalent proportions, it should be possible to determine the position of the ethylenic linkages in the original compound by careful oxidation of the mixture of methyl oleates formed, according to the methods given in the preceding communication.

The products of partial hydrogenation some higher polyethylenic esters