Abstract—Carbon isotope composition was analyzed in С21n‑alkylbenzene and n‑alklylnaphthalene from five Upper Devonian oils of the Timan–Pechora Basin. In spite of the variations in carbon isotope composition, the difference in δ13C between n‑alkylbenzene and n‑alklylnaphthalene is relatively constant and accounts for, on average, 2.7‰. It is generally accepted that these compounds were derived from a common source. Thus, the revealed carbon isotope fractionation is related to the cyclization and aromatization of aliphatic chain.

中文翻译：

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油中的С21n-烷基苯和1-n-烷基萘：环化/芳构化过程中的同位素效应？

摘要——分析了来自 Timan-Pechora 盆地的五种上泥盆统石油的 С21n-烷基苯和 n-烷基萘中的碳同位素组成。尽管碳同位素组成存在差异，但正烷基苯和正烷基萘之间的 δ13C 差异相对恒定，平均为 2.7‰。人们普遍认为这些化合物来源于共同的来源。因此，揭示的碳同位素分馏与脂肪链的环化和芳构化有关。