Summary
1. The geometrical forms obtained during autoxidation of methyl linoleate at ordinary temperatures are largely conjugatedcis-trans andtrans-trans as shown by previous workers; there is a possibility that conjugatedcis-cis forms are also produced.
2. Thetrans-trans molecules arise partly, at least, by thermal rearrangement of already formedcis-trans peroxide.
3. Some proportion, at least, of thecis-trans molecules have theirtrans double bonds nearest to the hydroperoxide group.
4. A partial separation of the geometrical forms can be accomplished by reversed phase partition chromatography both on methyl linoleate hydroperoxides and on the corresponding mixed hydroxy compounds; isolation of thetrans-trans forms can be accomplished in the latter case by urea complex fractionation.
5. No position isomers except the known 9- and 13-isomers have been positively identified; there is a possibility that very minor amounts of the 2-isomer are formed; the 9- and 13-isomers are present in about equal amounts; the 11-isomer was not detected by the methods applied.
6. Various ways in which the linoleate autoxidation problem might be advanced further are suggested.
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Sephton, H.H., Sutton, D.A. The chemistry of polymerized oils. V. The autoxidation of methyl linoleate. J Am Oil Chem Soc 33, 263–272 (1956). https://doi.org/10.1007/BF02630858
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DOI: https://doi.org/10.1007/BF02630858