Use of an Iodide-Modified Merrifield Resin in the Synthesis of Ruthenium Hydride Complexes. The Structure of RuHI((<i>R</i>)-binap)(PPh<sub>3</sub>)
Bibliographic record
Abstract
Transition metal complexes that function as catalysts or precatalysts are sometimes synthesized by the displacement of phosphine ligands from precursor complexes. A common problem in the synthesis is the separation of the desired complex from the phosphine contaminants that have similar solubility properties. This is the case in the synthesis of the coordinatively unsaturated ruthenium complexes RuHX(( R )-binap)(PPh 3 ) (X = Cl, 2; X = I, 3 ) from RuHCl(PPh 3 ) 3 ( 1 ). The new iodo ruthenium complex RuHI(( R )-binap)(PPh 3 ) ( 3 ) is prepared in good yield and purity by treatment of the chloro derivative 2, which is contaminated with triphenylphosphine, triphenylphosphine oxide, binap, binap monoxide, and binap dioxide, with an iodide-modified Merrifield resin. The resin was prepared following a modification of a procedure described by Lipshutz and Blomgren. The structure determination of 3 by single-crystal X-ray diffraction is reported. Complex 3 reacts with the alkoxides KOCR 2 -2-py (R = Me, potassium dimethyl-2-pyridylmethoxide; R = Ph, potassium diphenyl-2-pyridylmethoxide) to produce the coordinatively unsaturated hydrido alkoxide complexes RuH(OCR 2 -2-py)(( R )-binap) (R = Me 4, R = Ph 5 ). Complexes 4 and 5 are poor catalysts for asymmetric hydrogenation and are not catalysts for Michael addition reactions at room temperature, conditions where certain ruthenium complexes with diamine and phosphine ligands are known to be very active. The modified resin is demonstrated to be an effective phosphine scavenger in the synthesis of the known complex trans- RuH(I)(dppe) 2 ( 6 ) and the new complex trans- RuH(I)(dppb) 2 ( 7 ).
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.002 |
| 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".