GC-MS characterisation of C27 and C28 triterpanes in sediments and petroleum |
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| Authors: | John K Volkman Robert Alexander Robert Ian Kagi Jürgen Rullkötter |
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| Institution: | Petroleum Geochemistry Group, School of Applied Chemistry, Western Australian Institute of Technology, Hayman Road, South Bentley, Western Australia 6102, Australia;Institute of Petroleum and Organic Geochemistry (ICH-5), Kernforschungsanlage Jülich GmbH, D-5170 Jülich, Federal Republic of Germany |
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| Abstract: | Earlier studies have shown that an unusual C27 triterpane is abundant in sediments from the Norwegian Continental Shelf and the North Sea. This compound was assigned the tentative structures 24,28,30-trisnormoretane or 25,28,30-trisnormoretane, but we have now shown from detailed retention time measurements and a reinterpretation of the mass spectral data that its correct structure is 17α(H),18α (H),21β(H)-25,28,30-trisnorhopane. Two other triterpanes, 25,28,30-trisnormoretane and 28,30-bisnormoretane, have also been identified as minor constituents of extracts of sediments from the North Sea. Possible origins for these compounds are discussed. |
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| Keywords: | Author to whom correspondence should be addressed |
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