d<sup>10</sup> Nickel Difluorocarbenes and Their Cycloaddition Reactions with Tetrafluoroethylene
Bibliographic record
Abstract
We report the first isolable nickel difluorocarbene complexes (NiP 2 [P(OMe) 3 ](═CF 2 ); P 2 = Ph 2 P(CH 2 ) 2 PPh 2, 2 P(OMe) 3 ), which are also the only examples of formally d 10 metal fluorocarbenes. These [Ni 0 ]═CF 2 complexes react with tetrafluoroethylene (TFE) to yield the rare perfluorometallacyclobutanes [NiP 2 (κ 2 -CF 2 CF 2 CF 2 −)], with potential relevance to fluoroalkene metathesis and polymerization. Preliminary kinetic experiments establish that the reactions of the new [Ni]═CF 2 compounds with TFE are considerably faster than the analogous reactions of their previously reported [Co]═CF 2 counterparts. Further, we show that TFE addition to 2 is a dissociative process, in contrast to [Co]═CF 2, which reacts with TFE in an associative fashion. Finally, the preliminary reactivity of NiP 2 (κ 2 -CF 2 CF 2 CF 2 −) (P 2 = Ph 2 P(CH 2 ) 2 PPh 2 ) is described.
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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 | 0.001 |
| 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".