Bicyclic terpenoid sulfides

Figure 2. GC-FID chromatograms for the sulfide fractions from different Alberta petroleums. The peaks labeled B13 and B20 correspond to the bicyclic terpenoid sulfides with 13 and 20 carbons, respectively. The peak labeled T23 corresponds to the tetracyclic terpenoid sulfide with 23 carbons and peaks due to the hopane sulfides are indicated at the end of the chromatograms. The clusters of peaks spaced one carbon apart on the Bellshill Lake trace correspond mainly to complex mixtures of isomeric monocyclic sulfides possessing a linear carbon framework. These sulfides have been removed by biodegradation from the upper two samples. For more complete peak identification see References 9, 10 and 35. (Reproduced from Reference 34. Copyright 1989, American Chemical Society.)...

Figure 5. Capillary GC trace of the sulfide fraction from Athabasca maltene. Peaks labelled Bn correspond to bicyclic terpenoid sulfides with n carbons. The tricyclic terpenoid Cis sulfide (Triis) is not resolved from the Bis sulfide. Peaks corresponding to the tetracyclic C23 sulfide (Tetra23) and the hexacyclic sulfides are indicated. (Reproduced with permission from Ref. 10. Copyright 1986, Pergamon Journals Ltd.)...

Figure 7. Partial m/z =183 SIR-GC/MS chromatogram showing the distribution of bicyclic terpenoid sulfides in the C12-C22 range in Athabasca maltene.

Figure 14. Variation in the carbon number distribution of the bicyclic terpenoid sulfides as a function of depth as shown by the m/z =183 fragmentograms from the SIR-GC/MS experiment. All traces are normalized to the most abundant peak. The oils vary from a heavy Cretaceous oil (Lloydminster) to a light Devonian oil (Leduc). Increasing thermal maturity results in the gradual loss of the isoprenoid side chain until in the Leduc the C13 compound dominates the distribution. Note the intensity distribution of the peaks. Minima occur at C12, C17, and C23. (Reproduced from Ref. 10 with permission. Copyright 1986, Pergamon Journals Ltd.)...

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