Methyl Branched Alkenes

In contrast to the abundance of saturated methyl-branched hydrocarbons the unsaturated versions are less common. Information about methyl-branched alkenes in communication is sparse, although 13-methyl-Z6-heneicosene has been identified as the sex pheromone of the herald moth, Scoliopteryx libatrix (Francke et al. 2000), while 13, 17-dimethyl-1-tritriacontene and 13, 17-dimethyl-1-pentatriacon-tene have been identified as the contact sex pheromone components of the female tsetse fly, Glossina austeni (Kimura et al. 2001). Recent studies on the cuticular hydrocarbons of the invasive garden ant (Lasius neglectus) and some of its related species indicate that several methyl branched alkenes are present in relatively large quantities (Ugelvig et al. 2008), but their functions are not yet known.

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