Global Electrophilicity Study of the Reaction of Pyrroles with N-Halo Compounds and the Rate-Determining Step
Bibliographic record
Abstract
Pyrroles (nucleophiles) can react with N-halo compounds (electrophiles) to give either addition-elimination or halogenation products. Global electrophilicity (w) has been used to study electrophile-nucleophile combinations. The w values of the N-halo compounds (n = 22) used were calculated using DFT/B3LYP. No correlation was observed between w and the pathway of reaction/non-reaction. A single parameter (w) could not explain the results of the competing reactions that are taking place in this system–reactions that appear to depend on the N-halogen (Cl, Br, I) nucleophilicity/basicity and possibly hardness of the leaving group. These calculations confirmed that the rate-determining step of the addition-elimination process was not the formation of an sigma-complex, but its subsequent reaction. Calculations suggested that deprotonation of the sigma-complex was the rate-determining step in the halogenation reactions. It was also possible to examine the effects of the structure of the N-halo-compound and the halogen.
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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 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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".