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Compound "J'' in Late Cretaceous/Tertiary terrigenous oils revisited: Structure elucidation of a rearranged oleanane coeluting on GC with 18 beta(H)-oleanane
dc.creator | Nytoft, Hans Peter | |
dc.creator | Kildahl-Andersen, Geir | |
dc.creator | Šolević Knudsen, Tatjana | |
dc.creator | Stojanović, Ksenija | |
dc.creator | Rise, Frode | |
dc.date.accessioned | 2019-01-30T17:40:16Z | |
dc.date.available | 2019-01-30T17:40:16Z | |
dc.date.issued | 2014 | |
dc.identifier.issn | 0146-6380 | |
dc.identifier.uri | https://cer.ihtm.bg.ac.rs/handle/123456789/1470 | |
dc.description.abstract | A C-30 pentacyclic triterpane eluting slightly after 18 alpha(H)-oleanane in the m/z 191 mass chromatograms of Late Cretaceous/Tertiary terrigenous oils (peak "J'' in the early literature) has been isolated from a Niger Delta oil and identified using NMR spectroscopy as 3 beta-methyl-24-nor-18 alpha(H)-oleanane. The previous assignment as 18 beta(H)-oleanane is therefore partly erroneous. 3 beta-Methyl-24-nor-18 alpha(H)-oleanane affords a larger m/z 412 -> 356 response than the oleananes and the relative contribution of 3 beta-methyl-24-nor-18 alpha(H)-oleanane to the 412 -> 191 "oleanane peak'' can be roughly estimated from comparison of the 412 -> 356/412 -> 191 ratio from the oleanane peak with that of the pure compounds. 3 beta-Methyl-24-nor-18 alpha(H)-oleanane can be as abundant as 18a(H)-oleanane in oils having a high concentration of early eluting rearranged oleananes. 3 beta-Methyl-24-nor-19 alpha(H)-taraxastane was also tentatively assigned in the oils on the basis of its mass spectrum as well as its gas chromatography and high performance liquid chromatography retention times. 3 beta-Methyl-24-nor-gammacerane was tentatively assigned in a similar way in an oil containing gammacerane. All 3 beta-methyl-24-nor-triterpanes could be formed via dehydration, rearrangement and hydrogenation of triterpenoids having an OH group at C-3. | en |
dc.publisher | Oxford : Pergamon-Elsevier Science Ltd | |
dc.relation | info:eu-repo/grantAgreement/MESTD/Basic Research (BR or ON)/176006/RS// | |
dc.relation | Organisation for the Prohibition of Chemical Weapons (OPCW) | |
dc.rights | restrictedAccess | |
dc.source | Organic Geochemistry | |
dc.subject | Biomarkers | en |
dc.subject | Oleananes | en |
dc.subject | Rearranged oleananes | en |
dc.subject | Crude oil | en |
dc.subject | NMR | en |
dc.subject | HPLC | en |
dc.subject | GC-MS | en |
dc.title | Compound "J'' in Late Cretaceous/Tertiary terrigenous oils revisited: Structure elucidation of a rearranged oleanane coeluting on GC with 18 beta(H)-oleanane | en |
dc.type | article | |
dc.rights.license | ARR | |
dcterms.abstract | Килдахл-Aндерсен, Геир; Стојановиц, Ксенија; Шолевић Кнудсен, Татјана; Рисе, Фроде; Нyтофт, Ханс Петер; | |
dc.citation.volume | 77 | |
dc.citation.spage | 89 | |
dc.citation.epage | 95 | |
dc.citation.other | 77: 89-95 | |
dc.citation.rank | M21 | |
dc.identifier.doi | 10.1016/j.orggeochem.2014.09.010 | |
dc.identifier.scopus | 2-s2.0-84908328465 | |
dc.identifier.wos | 000345430500008 | |
dc.type.version | publishedVersion |