Syntheses of the CFY<sub>2</sub><sup>+</sup> (Y = Cl, Br) and CX<sub>3</sub><sup>+</sup> (X = Cl, Br, OTeF<sub>5</sub>) Cations Employing the Noble-Gas Oxidant, XeOTeF<sub>5</sub><sup>+</sup>Sb(OTeF<sub>5</sub>)<sub>6</sub><sup>-</sup>
Bibliographic record
Abstract
The strong oxidant properties of the noble-gas salt, XeOTeF 5 + Sb(OTeF 5 ) 6 -, have been exploited to synthesize Sb(OTeF 5 ) 6 - salts of trihalomethyl cations by the low temperature oxidation of a halide ligand of the corresponding tetrahalomethane in SO 2 ClF solvent. Among the trihalomethyl cations that have been synthesized are CCl 3 +, CBr 3 +, CFCl 2 +, and CFBr 2 +, as well as C(OTeF 5 ) 3 + . The carbocations have been stabilized as salts of the preformed, oxidatively resistant and weakly coordinating Sb(OTeF 5 ) 6 - anion, thus avoiding the use of more strongly coordinating anions derived from strong Lewis acid ligand acceptors such as SbF 5 . The CFCl 2 + and CFBr 2 + cations are the only known persistent fluorinecontaining trihalomethyl cations, and appear to be the most electrophilic fluorine-containing cations synthesized to date. Evidence has been obtained for transient formation of CF 2 Cl +, CF 2 Br +, and CF 3 + ) cations but, thus far, their high electrophilicities have precluded isolation.
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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 | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.002 |
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".