Coordinatively Diverse <i>ortho</i>-Phosphinoaniline Complexes of Ruthenium and Isolation of a Putative Intermediate in Ketone Transfer Hydrogenation Catalysis
Bibliographic record
Abstract
Amine-functionalized mono- and diphosphines have been used to prepare a series of ruthenium complexes which exhibit a variety of coordination modes depending on the number of donors possessed by the ligands, the degree of amine methylation, the solvent system used, and the oxidation state of the metal. Reactions of the monophosphinoanilines, Ph(2)PAr or Ph(2)PAr' (Ar = o-C(6)H(4)NHMe, Ar' = o-C(6)H(4)NMe(2)), with 0.5 equiv of [RuCl(mu-Cl)(eta(6)-p-cymene)](2) in dichloromethane result in the formation of [RuCl(2)(eta(6)-p-cymene)(P-Ph(2)PAr)] or [RuCl(eta(6)-p-cymene)(P,N-Ph(2)PAr')]Cl, respectively. In refluxing methanol, [RuCl(2)(eta(6)-p-cymene)(P-Ph(2)PAr)] gradually undergoes chloride ion dissociation to afford the P,N-chelate, [RuCl(eta(6)-p-cymene)(P,N-Ph(2)PAr)]Cl. This chelate can then be deprotonated to afford the amido complex, [RuCl(eta(6)-p-cymene)(P,N-Ph(2)PAr(-))] (Ar(-) = o-C(6)H(4)NMe(-)), which is an active ketone transfer hydrogenation catalyst. Reactions of the diphosphines, Ar(2)PCH(2)PAr(2) (mapm) or Ar'(2)PCH(2)PAr'(2) (dmapm) with 0.5 equiv of [RuCl(mu-Cl)(eta(6)-p-cymene)](2) result in the formation of [RuCl(2)(P,P',N,N'-mapm)] or [RuCl(eta(6)-p-cymene)(P,P'-dmapm)]Cl, respectively, in which increased methyl substitution in the latter actually inhibits amine coordination with retention of the p-cymene fragment. Reaction of mapm with 1 equiv of [Ru(CO)(4)(eta(2)-C(2)H(4))] in dichloromethane initially produces [Ru(CO)(4)(P-mapm)] which, over a 24 h period with exposure to ambient light, is completely converted to the P,P'-chelate, [Ru(CO)(3)(P,P'-mapm)], by photodissociation of carbon monoxide. The same reaction with 2 equiv of [Ru(CO)(4)(eta(2)-C(2)H(4))] generates a mixture of [Ru(3)(CO)(10)(mu-P,P'-mapm)] and the mononuclear P,P'-chelate. The trinuclear complex can also be synthesized by direct reaction of mapm with 1 equiv of [Ru(3)(CO)(12)].
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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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 | 0.000 |
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".