Determination of the absolute stereochemistries of the major acyclic isoprenoid-type acids in a sediment of Eocene age (the Green River Shale, Colorado, ca. 50 × 106 years) by g.l.c. analysis of the methyl and (–)methyl esters, indicates that the phytyl side chain of chlorophyll is the major ultimate precursor of the acids.
R. E. Cox, J. R. Maxwell, G. Eglinton, C. T. Pillinger, R. G. Ackman and S. N. Hooper, J. Chem. Soc. D, 1970, 1639 DOI: 10.1039/C29700001639
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