Hypercoordinated Organotin(IV) Compounds Containing ĸ²-C,O- And ĸ²,N- Chelating Ligands: Synthesis, Characterization, and Polymerization Behaviour
Why this work is in the frame
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Bibliographic record
Abstract
Rigid homopolystannanes and alternating polystannanes containing a benzyl methoxy ether (C,O) or benzyl dimethyl amine (C,N) ligand were prepared using either a direct approach, lithiation and transmetallation, or an alternative approach, either sequential chlorinations or brominations. X-ray crystallographic studies of 41 and 45 were conducted to find 41 in a distorted tetrahedral geometry with moderate hypercoordinate interaction (Sn-N: 2.917 Å) while 45 in a distorted trigonal bipyramidal with strong hypercoordinate interaction (Sn-N: 2.403 Å). Hydrogenation of 31 and 33 produced 42 and 43 in moderate-to-good yields. Dehydrocoupling polymerization produced modest molecular weight, rigid C,O- (Mw = 3.03 × 10⁴ Da, PDI: 1.4) and C,N- (Mw = 3.10 × 10⁴ Da, PDI: 1.82) homopolymers 56 and 57. Finally, condensation polymerization was attempted to produce low molecular weight (Mw = 1.30 × 10⁴ Da, PDI: 2.0) C,O- alternating polymer 60 and oligomer 61 (Mw = 0.92 × 10⁴ Da, PDI: 2.71).
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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 it