Abstract
Abstract A monoaromatic steroid hydrocarbon isolated from a catalytic dehydrogenation/isomerization mixture derived from 5α-cholestane was determined to be a (10β→ 5β) CH 3 -rearranged monoaromatic steroid (2a) by 1 HNMR analysis. Gas chromatography-mass spectrometry (GCMS) coinjection with a crude oil monoaromatic fraction and GCMS elution patterns suggest that this 5β-Me rearranged monoaromatic steroid is part of a series of C 27 -C 29 homologues in 20S and 20R pairs (2a-f) which are found in nearly all crude oils. Evidence from a study of Toarcian sediments from West Germany shows that the relative amounts of rearranged (2a-f) compared to regular (1a-1) C-ring monoaromatic steroids depends upon the strength of the anoxic environment during sedimentation. In addition, observation of rearranged/regular MA-steroid ratios in a suite of Jurassic oils demonstrates the differential effects of maturation on the preservation of the two series of biomarker compounds.
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