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 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 | 0.004 |
| Meta-epidemiology (narrow) | 0.006 | 0.006 |
| Meta-epidemiology (broad) | 0.006 | 0.004 |
| Bibliometrics | 0.003 | 0.010 |
| Science and technology studies | 0.003 | 0.003 |
| Scholarly communication | 0.002 | 0.004 |
| Open science | 0.004 | 0.003 |
| Research integrity | 0.004 | 0.008 |
| Insufficient payload (model declined to judge) | 0.000 | 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; 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".