CONSTITUENTS OF OSMANTHUS ABSOLUTE .6. (7S,10S,5E) AND (7R,10S,5E)-2,6,10-TRIMETHYL-7,10-EPOXY-2,5,11-DODECATRIENE

Constituents of Osmanthus Absolute, 6th Communication. (7S, 10S, 5E)‐ and (7R, 10S, 5E)‐2,6,10‐Trimethyl‐7,10‐epoxy‐2,5,11‐dodecatriene Two novel sesquiterpenoid oxides 1a and 1b from Osmanthus absolute have been identified. Their structural proof is based on pectral data and synthesis starting from the known methyl [5‐methyl‐5‐vinyl‐tetrahydrofur‐1‐yl] ketones (4a and 4b, respectively), whose configuration is well established. The thus obtained compounds 1a/1b identical with the natural products, were accompanied by their corresponding 6‐methylidene isomers 3a and 3b which could not be detected in the natural substrate. Copyright © 1979 Verlag GmbH & Co. KGaA, Weinheim