Abstract
Investigations covering two decades, in the field of minerals, including petroleum porphyrins has widened considerably our understanding of their group composition and special features of their chemical structure. In addition to members of the basic homologous series (alkylporphyrins (series M) and cycloalkano-porphyrins (series M-2)), two groups of green porphyrins were found with spectroscopic properties very different from those of petroleum vanadylporphyrins and other bituminous components of sedimentary rocks. These compounds are, usually, contained in increased proportions in high and low-polarity fractions of petroleum vanadylporphyrin concentrates. Experimental data reported by other workers and from our previous study confirm that the combination of a carbonyl group with a quasi-aromatic porphyin macroring system, is a distinctive feature of the structure of the polar green pigment group. Some new data are presented here which confirm this point of view, however, the work is devoted mainly to the separation and study of another group of green pigments, concentrated in the least polar fraction from chromatographic separation of petroleum vanadylporphyrins. This group of green pigments has been reported previously as compounds of a minor homologous series of rhodoporphyrins of petroleum deposits (petroleum rhodophorphyrins).
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