Addition-Isomerization Polymerization of Chiral Phosphaalkenes: Observation of Styrene–Phosphaalkene Linkages in a Random Copolymer
Bibliographic record
Abstract
These studies provide the first evidence for styrene–phosphaalkene connectivities in a phosphaalkene copolymer. The synthesis and structural characterization of new phosphaalkene–oxazolines, ArP═C(Ph)(3-C 6 H 4 Ox) [ 1a, b, Ar = Mes ( 1a ), Mes* ( 1b ), Ox = CNOCH( i Pr)CH 2 ], are reported. The radical-initiated homo- and copolymerization of 1a with styrene affords P -functional poly(methylenephosphine) ( 4a: M n = 5300 g mol –1, PDI = 1.2) and poly(methylenephosphine- co -styrene) ( 5a: M n = 4000 g mol –1, PDI = 1.1). Multinuclear NMR spectroscopic analyses of 4a and 5a provided evidence for the predominance of an addition-isomerization mechanism for the radical polymerization of 1a . In addition, signals could be assigned to CHPh–P(CHPhAr) (i.e., S– 1a ) and ArCH 2 –CH 2 (i.e., 1a –S) linkages in copolymer 5a . With a monomer feed ratio of 1a:S (1:2, 33 mol % 1a ) the inverse gated 13 C{ 1 H} NMR spectrum suggested an incorporation of 19 mol % 1a in copolymer 5a . Polymers 4a and 5a were further functionalized to Au(I)-containing macromolecules [ 4a ·AuCl: M n = 13 000, PDI = 1.2; 5a ·AuCl: M n = 7500, PDI = 1.1].
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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) | 0.004 | 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 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".