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Summary Sterculia foetida oil has been found to contain 71.8% of sterculic acid and minor proportions of oleic, linoleic, and saturated acids. The saturated component consists mostly of myristic and palmitic acids. The oil consists of traces of tristearin (0.8%) and a major quantity of tristerculin (31.4%) together with different amounts of the glycerides of the type GS2U, GSU2, and GU3 of other fatty acids.

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The Diels-Alder reaction between alkali conjugated and elaidinized safflower oil fatty acids and maleic anhydride was studied under various experimental conditions. The principal product which was obtained in 51-55% yields was a mixture of the adduct of maleic anhydride and maleic acid in 40:60 proportions. The isolation and properties of this mixed adducts from the reaction mixture and their conversion to trimethyl, tributyl and triallyl esters are described. The trimethyl ester was also obtained in good yield from the methyl esters of the fatty acids and dimethyl maleate.

Summary A series of methyl esters of fatty acids were reacted with N‐bromosuccinimide, and the products were dehydrobrominated by heating. In the reaction of metyyl erucate and methyl oleate with equivalent amounts of N‐bromosuccinimide, bromination occurred in the allylic position farthest from the carboxyl group. Products of dehydrobromination contained 30–40% conjugated dienoic acids. Use of excess N‐bromosuccinimide led to production of both diene and triene conjugation. Products from mono‐acetylenic fatty acids had a double bond conjugated to the triple bond initially present. The product from methyl 9∶12‐linoleate was a complex mixture having diene, triene, and tetraene conjugation. Mustard seed, peanut, olive, karanja, neem, tobacco seed, and safflower oils were reacted with N‐bromosuccinimide. The bromo derivatives could not be satisfactorily dehydrobrominated by heat alone; heating in pyridine, quinoline, or 2∶4∶6‐collidine was more effective. The products from safflower and tobacco seed oils partially gelled during the process. The films of all the treated oils dried in wrinkled patterns.