Construction of Rhodium(I) and Gold(I) Macrocycles by Transferring a Phosphine-Functionalized 4,5-Diazafluorenide Ligand from Its Copper(I) N-Heterocyclic Carbene Complex
Bibliographic record
Abstract
We report the synthesis and characterization of a phosphine-functionalized 4,5-diazafluorene ligand, 9-(2-(diphenylphosphino)ethyl)-4,5-diazafluorene (L p H), and its Cu(IPr) complex (IPr = N,N ′-bis(2,6-diisopropylphenyl)imidazol-2-ylidene) [Cu(IPr)L p ] ( 2a ), which exhibits a monomeric structure in solution but dimerizes in the solid state. Compound 2a reacts with Rh(PPh 3 ) 3 Cl, [Rh(COD)Cl] 2, Au(SMe 2 )Cl, and Au(IPr)Cl to form the macrocyclic complexes [Rh(PPh 3 )L p ] 2 ( 2b ), [Rh(COD)L p ] 2 ( 2c ), and [AuL p ] 2 ( 2d ) and the mononuclear complex [Au(IPr)L p ] ( 2f ), respectively, via ligand transfer. Although 2b – d, f could also be synthesized from the deprotonated ligand L p – and the corresponding metal starting materials directly, the reactions require longer time and give lower yields. The reaction between L p H and Au(SMe 2 )Cl gives Au(L p H) 2 Cl ( 2e ) exclusively.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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) | 0.002 | 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".