Syntheses and Reactivities of New PC<sub>s</sub><sub>p3</sub>P Pincer Complexes of Nickel
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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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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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 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 it