Tetrahedron letters

Molecular fossils of chlorophyll c of the 17-nor-DPEP Series. Structure determination, synthesis, geochemical significance.

J Verne-Mismer, R Ocampo, HJ Callot, P Albrecht

Index: Verne-Mismer, J.; Ocampo, R.; Callot, H. J.; Albrecht, P. Tetrahedron Letters, 1988 , vol. 29, # 3 p. 371 - 374

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Citation Number: 33

Abstract

Abstrsct: Two porphyrins 1 and 2, having totally (. I.) 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 ...