Delta. sup 2 -triterpenes: Early intermediates in the diagenesis of terrigenous triterpenoids

Journal Article · Fri May 01 04:00:00 EDT 1992 · Geochimica et Cosmochimica Acta; (United States)

DOI:https://doi.org/10.1016/0016-7037(92)90325-D· OSTI ID:5058921

Ten Haven, H L ^[1]; Peakman, T M ^[2]; Rullkoetter, J ^[3]

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1. Inst. Francais du Petrole, Rueil-Malmaison (France)
2. Univ. of Bristol (United Kingdom)
3. Univ. Oldenberg (Germany)

A series of {Delta}{sup 2}-triterpenoids (oleana-2,12-diene, oleana-2,13(18)-diene, oleana-2,18-diene, ursa-2,12-diene, and tarazera-2,14-diene) has been identified in Holocene buried mangrove sediments (Florida, USA) by comparison of the mass spectra of and by co-injections with authentic standards. In the Oligocene Brandon lignite (Vermont, USA) oleana-2,12-diene and oleana-2,13(18)-diene were also identified, along with two A-ring contracted amyrin derivatives. By comparison with the sedimentary occurrence of related analogues of oxyallobetulin and betulin and the demonstrated diagenetic formation of lup-2-ene from lupan-3-one, these novel terrigenous biological markers are considered diagenetic products formed by dehydration of precursor molecules, such as {alpha}- and {beta}-amyrin, and tarazerol. The identification of these early intermediates brings us one step closer to the full understanding of the diagenetic fate of terrigenous triterpenoids.

• OSTI ID: 5058921
• Journal Information: Geochimica et Cosmochimica Acta; (United States), Journal Name: Geochimica et Cosmochimica Acta; (United States) Vol. 56:5; ISSN GCACA; ISSN 0016-7037
• Country of Publication: United States
• Language: English

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