Tetracyclic 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 10. mlz = 319 SIR-GC/MS showing the distribution of the tetracyclic terpenoid sulfides in the C22-C31 range in Athabasca maltene. Note the presence of diastereoisomers. 

Figure 15. Variation in the carbon number distribution of the tetracyclic terpenoid sulfides as shown by the mlz = 319 fragmentogram from the SIR-GC/MS experiment. All traces are normalized to the most abundant peak. The carbon number distribution pattern of the tetracyclic sulfides is always dominated by the C23 compound except in samples of extreme water washing, e.g. Wolf Lake. Note the intensity distribution of the peaks. Minima occur at C22, C27, C32 and C37. (Reproduced from Ref. 10 with permission. Copyright 1986, Pergamon Journals Ltd.)...

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.)...

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