A Highly Reactive Ruthenium Phosphido Complex Exhibiting Ru−P π-Bonding
Bibliographic record
Abstract
Multiple bonding in the terminal phosphido complex [Ru(PCy 2 )(η 5 -indenyl)(PPh 3 )] ( 2a ) is clearly demonstrated by solution, solid-state, and computational studies. Reactions of this dark blue, half-sandwich complex with CO, MeI, HNEt 3 Cl, HCl, NH 4 PF 6, H 2, and Et 3 SiH demonstrate an unusual range of behavior resulting from combined coordinative unsaturation at Ru, high nucleophilicity/basicity of the phosphido P, and π-character of the Ru−P interaction. The terminal, π-bound phosphido structure is general for a range of PR 2 species (R = Pr i ( 2b ), Ph ( 2c ), Tol p ( 2d )). The very reactive diarylphosphido analogues 2c, d have been observed spectroscopically at low temperatures and can be trapped quantitatively as their CO adducts, [Ru(PAr 2 )(η 5 -indenyl)(CO)(PPh 3 )] ( 3c, d ), in which the Ru−P bond order is reduced to 1. Complex 2a and its analogue [Ru(PPr i 2 )(η 5 -indenyl)(PPh 3 )] ( 2b ) are consistently isolated with ∼15% of their structural isomers, the ruthenium hydrido phosphaalkenes 9a, b, resulting from an apparent 1,2-H shift.
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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) | 0.001 | 0.001 |
| 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) | 0.052 | 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".