Michigan State University
Evidence is provided that sterculic and malvalic acids occur together in seed oils of Sterculia foetida, Hibiscus syriacus, and Lavatera trimestris. Sterculia foetida oil contains 54.5% sterculic and 6.7% malvalic acids; Hibiscus syriacus oil contains 16.3% malvalic and 3.4% sterculic; and Lavatera trimestris oil contains 7.7% malvalic and 0.6% sterculic acids. Hibiscus syriacus oil also contains 1.5% dihydrosterculic acid. The cyclopropenoid acids were characterized by hydrogenation in conjunction with gas-liquid chromatography and by oxidation to β-dioxo acids with subsequent cleavage with peracetic acid. Acetolysis of epoxides in the presence of cyclopropenes was effected by room temperature treatment with acetic acid-10% sulfuric acid (5∶2). © 1961, The American Oil Chemists' Society. All rights reserved.