An oxidation reaction catalyzed by ruthenium ions has revealed that high-molecular asphaltenes of methano-naphthene oil from the Krapivinskoye oilfield contains structural fragments linked by means of Car-C bridges and non-covalently bound (occluded) compounds. It was found that covalently bound fragments in the composition of high mo-lecular weight asphaltenes of Krapivinskaya oil are represented by alkanes of normal structure, aromatic structures of biphenyl type and naphthalenes located in the periphery of the molecule. Typical hydrocarbon biomarkers such as n-alkanes, steranes, and terpanes are present among the occluded compounds.
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