Haptotropism in a Nickel Complex with a Neutral, π‐Bridging <i>cyclo</i>‐P<sub>4</sub> Ligand Analogous to Cyclobutadiene
Bibliographic record
Abstract
Abstract Dedicated to Professor Manfred Scheer on the occasion of his 65th birthday The reaction of ( 1 )Ni(η 2 ‐cod), 2 , incorporating a chelating bis( N ‐heterocyclic carbene) 1 , with P 4 in pentane yielded the dinuclear complex [( 2 )Ni] 2 (μ 2 ,η 2 : η 2 ‐P 4 ), 3 , formally featuring a cyclobutadiene‐like, neutral, rectangular, π‐bridging P 4 ‐ring. In toluene, the butterfly‐shaped complex [( 1 )Ni] 2 (μ 2 ,η 2 : η 2 ‐P 2 ), 4 , with a formally neutral P 2 ‐unit was obtained from 2 and either P 4 or 3 . Computational studies showed that a haptotropic rearrangement involving two isomers of the μ 2 ,η 2 : η 2 ‐P 4 coordination mode and a low‐energy μ 2 ,η 4 : η 4 ‐P 4 coordination mode, as previously predicted for related nickel cyclobutadiene complexes, could explain the coalescence observed in the low‐temperature NMR spectra of 3 . The insertion of the ( 1 )Ni fragment into a P−P bond of P 7 (SiMe 3 ) 3 , forming complex 5 with a norbornane‐like P 7 ligand, was also observed.
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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 | 0.000 |
| 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) | 0.004 | 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 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".