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.
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Chemical structures: (I) n‑henicosahexaene‑3,6,9,12,15,18; (II) n‑ henicosahexaene ‑1,3,5,7,9,12; (III) n‑pentadecylbenzene; (IV) 1‑n‑undecyl naphthalene; (V) 5‑n‑ undecyltetralin; (VI) 1‑n‑ undecyltetralin; (VII) 1‑n‑decyl‑5‑methyltetralin.
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Bushnev, D.A., Burdel’naya, N.S. & Valyaeva, O.V. С21n‑alkylbenzene and 1‑n‑alklylnaphthalene in Oils: Isotope Effect during Cyclization/Aromatization?. Geochem. Int. 58, 61–65 (2020). https://doi.org/10.1134/S0016702920010036
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DOI: https://doi.org/10.1134/S0016702920010036