Other
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54..247s&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 1, pp.247-251
Other
4
Scientific paper
Three C 31 methylhopanes have been prepared by partial synthesis from appropriate diplopterol precursors. 2 -Methyldiplopterol (prepared from22-hydroxyhopan-3-one), 2 -methyldiplopterol (isolated from Methylobacterium organophilum and a mixture of diplopterol and 3 -methyldiplopterol (isolated from Methylococcus capsulatus were each converted to the corresponding 17 (H), 21 (H)-hopane. Comparison of these standards, using gas chromatography-mass spectrometry with multiple reaction monitoring, with the hopanoids from a variety of bitumens showed that all three C 31 hydrocarbons may occur in sediments and that they are members of C 28 and C 30 -C 36 pseudohomologous series. 2 -Methyl-17 (H), 21 (H)-hopane and 3 -methyl-17 (H), 21 (H)-hopane are most commonly encountered in mature bitumens. 2 -Methyl-17 (H), 21 (H)-hopane occurs in some immature bitumens, is much less abundant in others of intermediate maturity and appears to be absent from mature samples. This and the similarity of the distribution patterns of homohopane and methylhomohopane isomers, indicates that the common sedimentary methylhopanes are probably derived from biogenic precursors via diagenetic processes analogous to those which give rise to hopanes. In the case of the 2 -methyl series, common to petroleum and mature sediments, derivation from the 2 -methyl hopanoids found in certain bacteria implies a maturity-related change in the configuration at C-2.
Jahnke Linda L.
Summons Roger E.
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