Abstract
Summary o 1. Mass-spectrometry, electron and PMR spectroscopy were used to examine the composition of individual chromatographic petroleum fractions of vanadylporphyrins from West Surgut petroleum. 2. It was found that mixtures of petroleum porphyrins contain compounds incorporating an isocyclic ring as well as compounds with unsubstituted β-positions in the pyrrole rings. The presence of a hydroxyl group in position 10 is a distinctive structural element of porphyrins of high polarity.
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