Vinyl-olefines, 1,7,10,13-Hexadecatetraene, Sesquiterpenes, Senecio isatideus (Compositae), Mass Spectroscopic Determination o f double bond positions A series of polyunsaturated vinyl-hydrocarbons («-C15 to n-C17) (10, 11, 12, 15, 16 and 17) including the as yet unknown a//-m-l,7,10,13-hexadecatetraene (15) as well as some rare sesquiterpenes such as isocomene (8) or modhephene (7) have been i...
