Novel Copolymers of Trisubstituted Ethylenes and Styrene. II. Halogen Ring‐Substituted Ethyl 2‐Cyano‐1‐oxo‐3‐phenyl‐2‐propenylcarbamates
Bibliographic record
Abstract
Electrophilic trisubstituted ethylenes (TSE), halogen ring‐substituted ethyl 2‐cyano‐1‐oxo‐3‐phenyl‐2‐propenylcarbamates, RC6H4CH˭C(CN)CONHCO2C2H5 (where R is 3‐Br, 4‐Br, 3‐Cl, 4‐Cl, 2‐F, 3‐F, and 4‐F) were prepared and copolymerized with styrene (ST). The monomers were synthesized by the piperidine catalyzed Knoevenagel condensation of ring‐substituted benzaldehydes and N‐cyanoacetylurethane, and characterized by CHN analysis, IR, 1H, and 13C NMR. All the ethylenes were copolymerized with ST (M1) in solution with radical initiation (AIBN) at 70°C. The compositions of the copolymers were calculated from nitrogen analysis and the structures were analyzed by IR, 1H, and 13C NMR. The order of relative reactivity (1/r 1) for the monomers is 2‐F (3.81) > 3‐Cl (1.36) > 4‐Br (1.31) > 3‐Br (1.13) > 4‐F (0.90) > 3‐F (0.63) > 4‐Cl (0.37). Higher T g of the copolymers in comparison with that of polystyrene indicates decrease in chain mobility of the copolymer due to the high dipolar character of the TSE structural unit. Gravimetric analysis indicated that the copolymers decompose in the range 303–319°C.
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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) | 0.001 | 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 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".