Abstract
Bicyclic alkanes containing the drimane skeleton have been identified in crude oils and sediments by synthesis of model compounds. Two other bicyclic alkanes, whose skeletons do not conform to the isoprene rule, have also been identified from mass spectral data. A correlation between the relative concentration of C 29 steranes and diasteranes and drimane and two C 15 bicyclanes in an extensive sample suite, suggests a similar mechanism is involved in the formation of diasteranes and the two C 15 bicyclanes in the subsurface. The widespread occurrence of drimanes and drimane-related compounds in crude oils and sediments indicates that these compounds are derived from a ubiquitous source. The presence of methyldrimanes in a sample rich in methylhopanes suggests that drimanes and hopanes may be derived from similar precursors.
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