Composition of the heteroorganic compounds of oil shale in Cambrian rocks from the east of the Siberian Platform

The molecular composition of the S-, O-, and N-containing heterocyclic aromatic compounds of bitumen separated from the rocks of the Cambrian oil shale formation was studied. Among the sulfur compounds, dibenzothiophene, its alkyl and naphthene derivatives, naphthobenzothiophenes, and their alkyl homologs were identified. Among the oxygen compounds, unbranched dibenzo- and naphthobenzofuran and their C₁–C₄ and C₁–C₂ alkyl homologs, respectively, were detected. Acridinones, benzoacridinones, and their alkyl homologs were present among the nitrogen compounds.