Dimetallacycles from Monomeric 18-Electron M(CO)<sub>4</sub>(η<sup>1</sup>-C<sub>2</sub>H<sub>2</sub>) and M(CO)<sub>5</sub>(M = Ru, Os) Building Blocks: Synthesis and Mechanism of Formation
Bibliographic record
Abstract
The synthesis and spectroscopic characteristics of M(CO) 4 (η 2 -C 2 H 2 ) (M = Os, 1a; Ru, 1b ) are presented. The compounds readily react with the parent pentacarbonyls to yield the dimetallacyclic compounds Os 2 (CO) 8 (μ-C 2 H 2 ) ( 2 ) and MRu(CO) 8 (μ-C 2 H 2 CO) (M = Os, 3; Ru, 4 ). The structure of the compounds, based on IR and 13 C NMR spectroscopies, including extensive 13 C labeling, depends on the M(CO) 5 . Kinetic studies of the formation of 2 and 3 show that, in both cases, the reaction is slowed by the addition of free CO, but the inhibition is much greater with Os(CO) 5 . The initial step is dissociation of CO from Os(CO) 4 (η 2 -C 2 H 2 ), and the inhibition results from the competition between the reverse of this dissociation and reaction of the unsaturated intermediate with Os(CO) 5 or Ru(CO) 5 . With CO added to the system, subsequent steps in the condensation may become rate-limiting. Studies of the Ru(CO) 5 /Os(CO) 4 (η 2 -C 2 H 2 ) system with 13 CO-enriched reactants reveal further details about the course of the reaction.
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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) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.001 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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; both teacher heads agree on what is shown here.
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".