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, XeOTeF5+Sb(OTeF5)6-, have been exploited to synthesize Sb(OTeF5)6- salts of trihalomethyl cations by the low temperature oxidation of a halide ligand of the corresponding tetrahalomethane in SO2ClF solvent. Among the trihalomethyl cations that have been synthesized are CCl3+, CBr3+, CFCl2+, and CFBr2+, as well as C(OTeF5)3+. The carbocations have been stabilized as salts of the preformed, oxidatively resistant and weakly coordinating Sb(OTeF5)6- anion, thus avoiding the use of more strongly coordinating anions derived from strong Lewis acid ligand acceptors such as SbF5. The CFCl2+ and CFBr2+ 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 CF2Cl+, CF2Br+, and CF3+) cations but, thus far, their high electrophilicities have precluded isolation.
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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 | 0.005 | 0.002 |
| Meta-epidemiology (narrow) | 0.013 | 0.012 |
| Meta-epidemiology (broad) | 0.010 | 0.006 |
| Bibliometrics | 0.004 | 0.005 |
| Science and technology studies | 0.009 | 0.009 |
| Scholarly communication | 0.004 | 0.005 |
| Open science | 0.011 | 0.007 |
| Research integrity | 0.012 | 0.016 |
| Insufficient payload (model declined to judge) | 0.000 | 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; both teacher heads agree on what is shown here.
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".