Structure and significance of some twenty-one and twenty-two carbon petroleum steranes

Details Structure and significance of some twenty-one and twenty-two carbon petroleum steranes Structure and significance of some twenty-one and twenty-two carbon petroleum steranes

Dec 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986gecoa..50.2763w&link_type=abstract

Geochimica et Cosmochimica Acta, Volume 50, Issue 12, p. 2763-2769.

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Scientific paper

Two steranes, commonly found in petroleum and petroleum source rocks, have been identified. One is the 5α, 14β, 17βH stereoisomer of pregnane called diginane and the other is 20-methyldiginane. These compounds are detected in the saturated hydrocarbon fraction of many crude oils by capillary gas chromatography-mass spectrometry. Both virtually coelute from a capillary gas chromatography column with a 5α, 14α, 17αH stereoisomer. The amount of the two diginanes in a petroleum sample, relative to the abundance of steranes having from twenty-seven to twenty-nine carbon atoms, seems to be an apparent indicator of thermal maturity.

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