Thermal Cracking of Substituted Cholestane–Benzoquinoline Asphaltene Model Compounds
Bibliographic record
Abstract
Six asphaltene model compounds incorporating the biomarker structure of 5α-cholestane, covalently fused to a range of differentially substituted benzoquinoline groups, were subjected to thermal cracking. Thermogravimetric analysis of the six compounds showed similar cracking kinetics and yields of solid residue (coke), with the heaviest compound, bearing a pyrenyl substituent, forming the largest amount of residue. Analysis of the products formed from thermal cracking of three such model compounds in a stainless steel microreactor showed mainly dehydrogenation of the saturated hydrocarbon rings, along with some peripheral demethylation, and steroid side-chain fragmentation, with no significant ring opening or release of cyclic substructures from the steroid moiety. Some loss of the aromatic substituents appended to the benzoquinoline moiety was also detected. Methylated products and dimers of the parent compounds were formed by addition reactions, which participated in further cracking and addition reactions as the conversion increased.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".