Synthesis and structure of dimeric Rh-bis(tertiary phosphine) complexes, exceptionally useful synthetic precursors
Bibliographic record
Abstract
Removal of the MeOH and hydrogen from the known cis,trans,cis -Rh III -dihydrido complexes 〚Rh(H) 2 (PR 3 ) 2 (MeOH) 2 〛PF 6 (R = Ph, p -tolyl) results in formation of the dimeric species 〚Rh 2 (PR 3 ) 4 〛〚PF 6 〛 2 ; X-ray analysis shows the complexes to be 〚(Ph 3 P)Rh(μ-PhPPh 2 )〛 2 〚PF 6 〛 2 (and the p -tolyl analogue) containing bridged η 6 -arene moieties, while 1 H and 13 C NMR data in CD 2 Cl 2 provide evidence for η 4 -coordination of the arene within the dimer. In more strongly coordinating solvents, formation of cis -〚Rh(PR 3 ) 2 (solvent) 2 〛PF 6 is observed, while formation of 〚(PR 3 ) 2 Rh(η 6 -toluene)〛PF 6 is evident in toluene solution, and this exists in equilibrium with the bis(solvent) species in the presence, for example, of acetone or MeOH. At ambient conditions, none of the arene-containing complexes effected catalytic H 2 -hydrogenation of toluene.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 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 source (direct Gemma or distilled Codex), 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".