Mathematics – Logic
Scientific paper
Sep 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56.3595h&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 56, Issue 9, pp.3595-3602
Mathematics
Logic
1
Scientific paper
Two ring-B aromatized triterpenes related to the arborane/fernane series were isolated from an Italian Triassic black shale ( 4 and 7 ) and a French Jurassic laminated bituminous limestone (7). They were identified by MS and NMR spectroscopy. These compounds, 25-norferna-5,7,9-triene 7 (C 29 ) and 22,25,29,30-tetranor-18 -ferna-5,7,9-triene 4 (C 26 ), in the case of the Italian sediment, belong to a family which extends to at least C 32 as shown by GC-MS. The presence of higher homologs and ring-A methylated structures in the Italian Triassic shale is analogous with the hopane series, which together with carbon isotopic data obtained by gas chromatography-isotope ratio mass spectrometry (GC-IRMS), strongly support a bacterial origin for most of these compounds. This suggests that 4 and 7 may result from a yet unrecognized rearrangement of sedimentary hopenes which have subsequently undergone ring-B aromatization. As an alternative, the C 29 compound 7 could arise from C 30 precursors not necessarily of bacterial origin (fernenes?). This hypothesis would apply particularly to the case of the Jurassic limestone, which does not show any trace of 4 nor of compounds with an extended side chain or a methyl group on ring A. Related structures also bearing an isopropyl group could derive by microbiological transformations from the corresponding fernen-3 -ols or isoarborinol as can be deduced from the occurrence of ring-A degraded monoaromatic hydrocarbons 3 and 5.
Albrecht Pierre
Buchs Armand
Eakin Paul A.
Graff Roland
Gülaçar Fazil O.
No associations
LandOfFree
Novel triterpene-derived hydrocarbons of the arborane/fernane series in sediments: Part II does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Novel triterpene-derived hydrocarbons of the arborane/fernane series in sediments: Part II, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Novel triterpene-derived hydrocarbons of the arborane/fernane series in sediments: Part II will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1767683