Rapid Aerial Oxidation of Ruthenium-Dithiocatecholate Catalysts: A Challenge to Stereoretentive Olefin Metathesis
Bibliographic record
Abstract
Ruthenium dithiolene complexes, particularly the dithiocatecholates Ru(S 2 C 6 H 2 -3,6-Cl 2 )(NHC)(=CHC 6 H 4 -2-O i Pr) (NHC = H 2 IPr, H 2 IMes), are an important class of olefin metathesis catalysts employed for the stereocontrolled assembly of C=C bonds. The poorly understood sensitivity of these catalysts results in unpredictable performance. Here they are shown to resist degradation by amine nucleophiles, in contrast with their dichloride parents; however, they are significantly more oxygen-sensitive. Even as the precatalysts, they decompose within minutes in solution under O 2, eliminating the alkylidene ligand as O=CHC 6 H 4 -2-O i Pr and forming unusual, four-coordinate Ru(IV)-oxo products, Ru(O)(S 2 C 6 H 2 -3,6-Cl 2 )(NHC). Participation of the latter in O-transfer with PPh 3 suggests potential opportunities in catalytic oxidation.
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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 | 0.001 |
| 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) | 0.001 | 0.001 |
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".