Synthesis and characterization of amphiphilic nitroxide 1,1,3,3–tetraethylisoindoline–2–oxyl–5–sodium sulfonate ( <scp>TEIOSNa</scp> )
Bibliographic record
Abstract
Abstract The synthesis and characterization of an amphiphilic nitroxide to be used as a controlling agent in a nitroxide‐mediated living radical polymerization in aqueous dispersion media is presented. In the first stage of nitroxide synthesis (phthalimide protection), two reaction methods were employed: traditional and microwave. In this stage, high efficiency of benzylphthalimide with reduced reaction times was achieved using microwaves. The synthesis of sodium 1,1,3,3–tetraethylisoindoline–2–oxyl–5–sulfonate (TEIOSNa) was characterized at each stage by infrared spectroscopy and 1H and 13C nuclear magnetic resonance, and the final nitroxide was analyzed and confirmed by electron paramagnetic resonance (EPR). Because of its hydrophilic nature, the efficiency of TEIOSNa could not be determined. This work presents a new alternative for the synthesis of amphiphilic nitroxides, supported by microwaves and some adjustments during synthesis, which has allowed improved efficiency compared to those obtained with traditional methods. A route for the substitution of ethyl groups by the Grignard reaction was proposed and investigated using computational simulations with Spartan V10 Wavefunction software. These analyses allowed for the identification and postulation of possible secondary subreactions that could significantly reduce the efficiency during the synthesis of the desired nitroxide. This work proposes an efficient method to obtain TEIOSNa for direct application in CLRP in dispersed media.
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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 | 0.000 | 0.001 |
| 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) | 0.000 | 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; a candidate call from one teacher head, 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".