Abstract
Summary The hydrocarbon-fraction of Peltigera canina yielded a homologous series of n-alkanes (27%) ranging in chain length from C 13 to C 37 , n-heptadecane (17.1%) being the main representative. Predominant in this fraction was a series of n-alkenes (73%) with chain lengths from C 15 to C 35 . The major components were isomeric heptadecenes (63.9%). With the aid of infrared spectrophotometry and combined gas chromatography mass spectrometry of the corresponding di-O-trimethylsilylglycol derivatives the major alkene components could be identified as Δ 5 cis heptadecene (29.4%) Δ 3 cis heptadecene (34.5%), Δ 6 cis octadecene (6.6%) and Δ 7 cis nonadecene (0.1%). Traces of Δ 4 cis hexadecene, Δ 7 octadecene, Δ 7 and Δ 9 heptadecene could also be found. The influence of algae or fungi on the hydrocarbon pattern from the lichen Peltigera canina is discussed.
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