Nickel-Triflate Complexes as Precursors to Reactive Cations: Preparation and Reactivities of (1-R-indenyl)Ni(PPh<sub>3</sub>)(OSO<sub>2</sub>CF<sub>3</sub>)
Bibliographic record
Abstract
The complexes (1-R-indenyl)Ni(PPh 3 )(OTf) (OTf = OSO 2 CF 3; R = Et ( 1 ), i- Pr ( 2 ), and Bz ( 3 )) have been prepared by reacting the corresponding Ni-thienyl or Ni-Cl precursors with HOTf (triflic acid) or AgOTf, respectively. The triflate ligand in these complexes undergoes facile displacement by various substrates or ligands to facilitate (a) catalytic dimerization of ethylene, isomerization of 1-hexene, and polymerization of phenylacetylene, or (b) formation of the cationic complexes [(1-R-indenyl)(PPh 3 )Ni(L)] + (R = i -Pr ( a ) and CH 2 Ph ( b ); L = CH 3 CN ( 4 ), PhCN ( 5 ), CO ( 6 ), Py ( 7 ), CNC(CH 3 ) 3 ( 8 ), PPh 3 ( 9 ), and PMe 3 ( 10 )). Compounds 1 − 10 have been characterized spectroscopically and, in the case of complexes 2, 4a, and 8a, by single-crystal 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) | 0.000 | 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 | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".