Syntheses and Reactivities of New PC<sub>s</sub><sub>p3</sub>P Pincer Complexes of Nickel
Bibliographic record
Abstract
Heating Ni(II) halides with 1 equiv of Bu t 2 P(CH 2 ) 5 PBu t 2 gives the PC sp3 P pincer complexes [{(Bu t 2 P(CH 2 ) 2 ) 2 CH}NiX] (X = Cl, 1a; Br, 1b; I, 1c ). These compounds react with MeMgCl or n -BuLi to give, respectively, the methyl species {(Bu t 2 P(CH 2 ) 2 ) 2 CH}NiMe, 2, or the hydride species {(Bu t 2 P(CH 2 ) 2 ) 2 CH}NiH, 3, while reaction with NaBPh 4 in a mixture of benzene/acetonitrile gives the cationic species [{(Bu t 2 P(CH 2 ) 2 ) 2 CH}Ni (N⋮CCH 3 )][BPh 4 ], 4 . Complexes 1 − 3 are inert toward olefins, but react with PhSiH 3 to give (PhSiH) n . The cationic complex 4 is also inert toward most olefins, but its reaction with excess acrylonitrile results in displacement of coordinated acetonitrile to give [{(Bu t 2 P(CH 2 ) 2 ) 2 CH}Ni(N⋮CCH CH 2 )][BPh 4 ], 5 . Complexes 1 − 5 have been characterized by NMR spectroscopy and, in the case of 1, 4, and 5, by X-ray crystallography.
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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) | 0.001 | 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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".