Ring Opening of a Cobalt-Stabilized Bornyl Cation: Mechanistic Study of the Alkyne−Dicobalt/Carbynyl−Tricobalt Cluster Transformation
Bibliographic record
Abstract
Upon protonation with HBF 4, [2- endo -((allyldimethylsilyl)ethynyl)borneol]Co 2 (CO) 6 ( 2 ) suffers elimination of water or propene, to yield [2-((allyldimethylsilyl)ethynyl)born-2-ene]Co 2 (CO) 6 ( 11 ) and [2- endo -((dimethylfluorosilyl)ethynyl)borneol]Co 2 (CO) 6 ( 12 ), respectively, and, surprisingly, the tricobalt complex (2-norbornylidene)CHCCo 3 (CO) 9 ( 13 ). In contrast, protonation of the terminal alkyne (2- endo -ethynylborneol)Co 2 (CO) 6 ( 19 ), an anticipated precursor to 13, led instead to (2-ethynyl-2-bornene)Co 2 (CO) 6 ( 21 ) and the ring-opened species (2-ethynyl-4-isopropyl-1-methylcyclohexa-1,3-diene)Co 2 (CO) 6 ( 22) . However, conversion of 19 to 13 was achievable upon prolonged heating at reflux in acetone, thereby also affording the corresponding alcohol [2-(2-hydroxybornyl)]CH 2 CCo 3 (CO) 9 ( 20 ). A mechanistic rationale is offered for the formation of RCH 2 CCo 3 (CO) 9 clusters upon protonation of alkyne complexes of the type (RC⋮CH)Co 2 (CO) 6 .
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 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".