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The molecular proportionality between C6 and C7 isomers reported recently (F. D. Mango, <it>Geochim. Cosmochim. Acta</it>, 2000, 64, 1265; ref. 1) is probably the strongest evidence for catalysis yet published. It implicates two cyclopropane-like precursors, [S6] and [S7] (where S denotes any substrate), of similar structures, each yielding three isomers along similar kinetic pathways: [S6] → <it>n</it>-hexane + 2-methylpentane + 3-methylpentane [S7] → <it>n</it>-hexane + 2-methylhexane + 3-methylhexane This view is supported here by the carbon isotope ratios of these isomers in 36 oils from Western Canada (M. J. Whiticar and L. R. Snowdon, <it>Org. Geochem.</it>, 1999, 30, 1127; ref. 2). They exhibit strong correlations in <it>δ</it>13C, consistent with their being formed in triads through isotopically indistinguishable precursors. These results add significantly to the growing body of evidence supporting catalysis.</p

Carbon isotopic evidence for the catalytic origin of light hydrocarbons