Hydrophobic Polymer-Supported Lewis Acid for Solid-Phase Synthesis
Bibliographic record
Abstract
Conventional unsupported Lewis acids are more sensitive towards moisture rather than substrate resulting into deactivation of the catalyst and difficult to use in an anhydrous reaction. In the present work, deactivation of the conventional Lewis acids was strongly avoided by using hydrophobic polymer-supported Lewis acids (PSLAs). The obtained PSLAs were characterized by different techniques including surface area, particle size, thermostability, glass transition temperature, and morphology. Surface areas of PSLAs were in the range of 50-80 m 2 /g whereas particle sizes of polymer beads were in the range of 15-35 μm before and after polymer modification. Further, degradation of base polymer and PSLAs were in the range of 440-450 o C whereas glass transition temperature (Tg) of base polymer was upto 400 o C. However, Tg was attenuated for polymer containing AlCl3 and further for HgCl2. Importantly, leakage problem of the Lewis acids was eliminated due to strong co-ordinate bonding between polymer and catalyst.
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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 | 0.002 |
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; 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".