Computer Science
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50..343m&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 50, Issue 3, pp.343-351
Computer Science
2
Scientific paper
A monoaromatic steroid hydrocarbon isolated from a catalytic dehydrogenation/isomerization mixture derived from 5 -cholestane was determined to be a (10 5 ) 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 5 -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.
Fago Frederick J.
Moldowan Michael J.
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