Abstract
STERCULIC and malvalic acids are the only fatty acids known to contain a cyclo-propene ring in their structures. From the seed oil of Sterculia foetida (Sterculiaceae), Nunn1 isolated sterculic acid (C19) and defined its structure. Malvalic acid (C18) isolated from Malvaceae by Shenstone and Vickery2 has been structurally identified by Macfarlane, Shenstone and Vickery3 and Craven and Jeffrey4. Afterwards we reported5 the occurrence of minor amounts of sterculic acid associated with malvalic acid in the oils from some malvaceous plants. The occurrence of both acids in the seeds of Sterculia foetida and two species of Malvaceae has also been observed by C. R. Smith, jun., T. L. Wilson and K. L. Mikolajczak (private communication).
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