Butanal Condensation Chemistry Catalyzed by Brønsted Acid Sites on Polyoxometalate Clusters
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Bibliographic record
Abstract
Abstract The connection of active site structures and their catalytic chemistry during butanal deoxygenation on polyoxometalate clusters with varying H + site densities and identity of central atoms [H x Na 4− x SiW 12 O 40 ( x =0–4) and H y Na 3− y PW 12 O 40 ( y =0–3)] was established with rate assessment, IR spectroscopic, and chemical titration methods. Butanal adsorbs on the H + or Na + ions on polyoxometalate clusters and forms RC=O⋅⋅⋅H + or RC=O⋅⋅⋅Na + complexes at 348 K. A portion of the adsorbed butanals on the H + sites converts to surface acetates through their reactions with vicinal framework oxygen atoms, as confirmed from the detection of ν as (OCO) band at approximately 1580 cm −1 , and remains as the spectator species. Bimolecular reactions of butanals on the remaining H + sites lead to 2‐ethyl‐2‐hexenal as the predominant products, within which a small fraction undergoes sequential cyclization–dehydration to produce aromatics. A trace amount of butanal converts through minor, competitive pathways that form light olefins and dienes. These findings on the connection between active sites and their catalytic chemistry provide mechanistic insights useful for tuning the rates of the various concomitant paths and thus yields towards the different products during deoxygenation reactions.
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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) | 0.000 | 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) | 0.003 | 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 it