Anion Stability in Stannylium, Oxonium, and Silylium Salts of the Weakly Coordinating Anion [C<sub>6</sub>F<sub>4</sub>-1,2-{B(C<sub>6</sub>F<sub>5</sub>)<sub>2</sub>}<sub>2</sub>(μ-OCH<sub>3</sub>)]<sup>-</sup>
Bibliographic record
Abstract
Reaction of [Ph 3 C] + [C 6 F 4 -1,2-{B(C 6 F 5 ) 2 } 2 (μ-OCH 3 )] -, 1, with Bu 3 SnH gives the solvated stannylium ion [Bu 3 Sn(arene)] + [C 6 F 4 -1,2-{B(C 6 F 5 ) 2 } 2 (μ-OCH 3 )] -, 2, as a light brown oil (δ 119 Sn = 434 ppm). This material is thermodynamically stable toward transfer of the chelated OMe - anion to “Bu 3 Sn + ” as evidenced by the reaction of free diborane C 6 F 4 -1,2-[B(C 6 F 5 ) 2 ] 2 with 2 equiv of Bu 3 SnOMe. This reaction produces the stannyloxonium complex [(Bu 3 Sn) 2 OCH 3 ] + [C 6 F 4 -1,2-{B(C 6 F 5 ) 2 } 2 (μ-OCH 3 )] -, 3 (δ 119 Sn = 277 ppm), which is stable at −60 °C. Upon warming, the cation in 3 undergoes decomposition to unidentified products, while the anion remains intact. Ion pair 2 reacts rapidly with ethereal HCl in CH 2 Cl 2 to generate Bu 3 SnCl and the oxonium acid [(Et 2 O) 2 H] + [C 6 F 4 -1,2-{B(C 6 F 5 ) 2 } 2 (μ-OCH 3 )] -, 4, isolated in 76% yield as a white, crystalline solid. Acid 4 is thermally stable in solution and was characterized crystallographically. The C 2 B 2 OMe core of the anion in 4 deviates from planarity due to intermolecular interactions in the crystal, in contrast to the structures found in other ion pairs with this anion. Reaction of 2 with anhydrous HCl gives the unsymmetrical MeOH adduct of C 6 F 4 -1,2-[B(C 6 F 5 ) 2 ] 2, 5, which was separately synthesized by direct reaction of methanol with the free diborane. The anion [C 6 F 4 -1,2-{B(C 6 F 5 ) 2 } 2 (μ-OCH 3 )] - is not stable in the presence of the triethylsilylium ion, generated from 1 and Et 3 SiH.
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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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 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".