Tetrahedron Letters p. 371 - 374 (1988)
Update date:2022-08-11
Topics:
Verne-Mismer, J.
Ocampo, R.
Callot, H. J.
Albrecht, P.
Two porphyrins 1 and 2, having totally (1) or partially (2) lost the C-17 substituent, have been isolated from two Moroccan oil shales of Cretaceous age.An origin from chlorophyll c, which possesses a 17-acrylic side-chain, can explain this transformation.A synthesis of 1 from chlorophyll (a+b) is described.Porphyrin 1 is widely distributed in sediments and its relative abundance with regard to other molecular fossils of chlorophyll c is discussed briefly.
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