Polycyclic aromatic hydrocarbons in Australian coals II. Novel tetracyclic components from Victorian brown coal |
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| Authors: | Alan L Chaffee Michael G Strachan RB Johns |
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| Institution: | Department of Organic Chemistry, University of Melbourne, Parkville, Victoria, Australia 3052 |
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| Abstract: | Gas chromatographic-mass spectrometric (GC-MS) analysis of a polycyclic aromatic hydrocarbon (PAH) fraction of a Victoria brown coal sample has revealed the presence of a novel series of tetracyclic triterpenoid derived components. The base peak of their mass spectra, at m/z 169, suggests an 8, 14-seco (C-ring cleaved) structural configuration with the triterpenoid derived A- and B-rings fully aromatized. Photochemically induced or acid-catalyzed processes are seen as two possibilities to account for the diagenetic formation of these compounds. |
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