Occurrence of (20 R )- and (20 S )- 8 (14) and 14 5 ( H )-sterenes and the origin of 5 (H),14 (H),17 (H)-steranes in an immature sediment

Details Occurrence of (20 R )- and (20 S )- 8 (14) and 14 5 ( H )-sterenes and the origin of 5 (H),14 (H),17 (H)-steranes in an immature sediment Occurrence of (20 R )- and (20 S )- 8 (14) and 14 5 ( H )-sterenes and the origin of 5 (H),14 (H),17 (H)-steranes in an immature sediment

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989gecoa..53.2001p&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 53, Issue 8, pp.2001-2009

Computer Science

2

Scientific paper

Series of (20 R )- and (20 S )- 8 (14) and 14 5 ( H )-sterenes have been identified in an immature marl from a hypersaline deposit (northern Apennines, Italy) by co-injection studies with authentic compounds. These alkenes co-occur with 13 (17) 5 (H)-spirosterenes and transient (20 R )- and (20 S )- 14 5 ( H ), 17 (H)-sterenes. The source of these isomeric steroid alkenes is probably 7 (and 8(14) ) 5 (H)sterols via ( 2,7 ), 2,8(14) and 2,14 5 ( H )-steradienes. Reduction processes in the sediment, via the 14 5 (H),17 (H)-sterenes, can give rise to the C-20 isomeric 5 (H),14 (H),17 (H)-steranes present in "anomalously" high relative abundances from a thermal maturity viewpoint. This diagenetic pathway is supported by laboratory rearrangement/hydrogenation experiments of 5 (H)-cholest-7-ene and from considerations of carbon number distributions of various steroid hydrocarbons in the sediment extract.

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