Fossil porphyrins: uncomplexed chlorins in a triassic sediment

Details Fossil porphyrins: uncomplexed chlorins in a triassic sediment Fossil porphyrins: uncomplexed chlorins in a triassic sediment

Sep 1961

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1961gecoa..25...81b&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 25, Issue 2, pp.81-90

Physics

2

Scientific paper

The Triassic oil shale of Serpiano (Switzerland) contains, besides the well-known tetrapyrrole pigments of the porphyrin class, some small amounts of chlorins. These pigments have now been isolated and identified as desoxomesoetiopyropheophorbide a and etiochlorin III, with their structure confirmed both by dehydrogenation to the corresponding porphyrins and by synthesis. These ancient chlorins are not direct descendants of chlorophyll; rather, they are secondary, synthetic chlorins, formed by hydrogenation of meso- and desoxophyllerythroetioporphyrin under extreme reducing conditions, probably in a late diagenetic stage in the sediment.

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