Structures corresponding to various degrees of aromatization have been found, indicating that these hydrocarbons undergo further aromatization after C-ring cleavage. This second type of reaction is illustrated here for the first time. These compounds are produced during coalification through triterpenoid aromatization processes that involve C-ring opening (C 8(14) bond cleavage) and preservation or loss of the A-ring. Five novel ethylene-linked polymethyl-substituted phenyl/naphthyl or naphthyl/naphthyl hydrocarbons have been identified in aromatic hydrocarbon fractions of immature Tertiary coals using liquid chromatography, gas chromatography (GC), and GC coupled to mass spectrometry.
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