Abstract
A novel C 26 HBI alkane [2,6,10,13,14-pentamethyl-7-(3′-methylpentyl)pentadecane] and C 26 highly branched isoprenoid (HBI) thiophenes, possessing the same carbon skeleton, have been tentatively identified in sediments of the Oligocene Menilite Formation of the Outer Carpathians, SE Poland. The structural identity of these compounds has been assigned by mass spectral and relative retention time data, and by desulfurization followed by hydrogenation of the C 26 HBI thiophenes. The C 26 HBI compounds show structural similarities to known C 25 HBIs but possess an additional methyl group at C-13. The identical thiophene isomer distribution and similar stable carbon isotope compositions of the C 25 and C 26 HBI thiophenes point towards a biological HBI precursor polyene with double bonds in the same position, probably originating from the same diatom species.
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