Ligand Attachment Chemistry in the Preparation of PC<sub>sp<sup>3</sup></sub>P and PC<sub>sp<sup>2</sup></sub>P Complexes of Rhodium
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide The attachment of electron-rich PCP pincer ligands bis(2-(dialkylphosphino)phenyl)methane (alkyl = isopropyl, tert -butyl) to rhodium via reactions with [(COE) 2 Rh(μ-X)] 2 (X = Cl, OSO 2 CF 3 ) through C–H bond activations is reported. The first C–H activation to produce PC sp 3 P derivatives is facile and favors products wherein the remaining benzylic C–H and the Rh–H hydrogens are trans-disposed across the new Rh–C bond. For the less bulky isopropyl-substituted ligand, chlorido- or triflato-bridged dinuclear products are favored, while for the tert -butyl-adorned ligand, monomers are formed. The favoring of both trans C–H/Rh–H and dinuclear systems hampers the second C–H activation, necessary to form the (more desirable) PC carbene P derivatives. Through spectroscopic and structural investigations, the factors that influence the ligand attachment chemistry through successive C–H activations in these ligands are discussed.
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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 | 0.000 |
| 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) | 0.000 | 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".