Stereochemical studies of acyclic isoprenoid compounds--II The role of chlorophyll in the derivation of isoprenoid-type acids in a lacustrine sediment

Details Stereochemical studies of acyclic isoprenoid compounds--II The role of chlorophyll in the derivation of isoprenoid-type acids in a lacustrine sediment Stereochemical studies of acyclic isoprenoid compounds--II The role of chlorophyll in the derivation of isoprenoid-type acids in a lacustrine sediment

Feb 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973gecoa..37..297m&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 37, Issue 2, pp.297-313

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Scientific paper

The stereochemistries of a series (I)-(IX) of isprenoid-type acids in the lacustrine Green River Shale (Eocene) have been examined. The absolute configurations of five of the acids present in the free-fatty acid fraction have been determined by high resolution gas Chromatographic analysis of the methyl and (-)-menthyl esters and are compatible with an origin from the phytyl moiety of chlorophyll. The results for two other isoprenoid-type acids, 5,9,13-trimethyltetradecanoic acid (IV) and 6,10,14-trimethylpentadecanoic acid (VI), do not at present preclude a chlorophyll derivation. The 4,8,12,16-tetramethylheptadecanoic (VIII) and 5,9,13,17-tetramethyloctadecanoic (IX) acids each comprise two or more stereoisomers. The stereoisomeric composition of the 2,6,10,14-tetramethylpentadecanoic acid (VI) indicates that it is unlikely that 2,6,10,14-tetramethylpentadecane, pristane, is an intermediate in the geochemical pathways presumed to lead from phytol to this acid.

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