Cationic and Neutral Phosphido-Bridged Pentamethylcyclopentadienyl−Chromium Dimers
Bibliographic record
Abstract
The species [(Cp*Cr) 2 (μ-Cl) 3 ]X (X = [AlCl 4 ] ( 3 ), [GaCl 4 ] ( 4 ), [B(C 6 F 5 ) 4 ] ( 5 )) were generated from (Cp*CrCl(μ-Cl)) 2 ( 1 ) via reaction with a chloride abstraction reagent. Using a similar synthetic route, the reaction of 1, generated in situ, with MeLi and the borane B(C 6 F 5 ) 3 gave crystals of the salt [(Cp*Cr) 2 (μ-Cl) 3 ][MeB(C 6 F 5 ) 3 ] ( 6 ), while the complex [(Cp*Cr) 2 (μ-Cl) 3 ][Me 2 B(C 6 F 5 ) 2 ] ( 7 ) was obtained, albeit in low yield, from the reaction of [Cp*CrMe(μ-Cl)] 2 with HB(C 6 F 5 ) 2 . Monoalkylation of 5 with MeLi gave [(Cp*Cr(μ-Cl)) 2 (μ-Me)][B(C 6 F 5 ) 4 ] ( 8 ), while the related mono(phosphide)-bridged cationic species [(Cp*Cr) 2 (μ-PPh 2 )(μ-Cl) 2 ][B(C 6 F 5 ) 4 ] ( 9 ) was derived from 5 via reaction with Ph 2 PLi. The bis(phosphide)-bridged species [(Cp*Cr(μ-PPh 2 )) 2 (μ-Cl)][AlMe 3 Cl] ( 10 ) was derived from reaction mixtures of 1, Ph 2 PLi, and AlMe 3, while monoalkylation of 1 with MeLi followed by treatment with Ph 2 PLi and AlMe 3 yielded [(Cp*Cr(μ-PPh 2 )) 2 (μ-Me)][(Me 3 Al) 2 (μ-Cl)] ( 11 ). The neutral phosphide-bridged species (Cp*Cr(μ-PPh 2 )) 2 (μ-CH 2 ) ( 12 ) and (Cp*Cr) 2 (μ-PPh 2 )(μ-Cl)(μ-CH 2 ) ( 13 ) were obtained from reactions of 1, MeLi, and Ph 2 PLi. X-ray structural data are reported from compounds 5 − 13 . The synthetic routes and the structural data 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 | 0.000 | 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) | 0.045 | 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".