Unveiling the Reactivity of Cyclic Azomethine Ylides in [3+2] Cycloaddition Reactions within the Molecular Electron Density Theory
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Bibliographic record
Abstract
The [3+2] cycloaddition (32CA) reactions of cyclic azomethine ylides with a series of acetylene derivatives have been studied within the Molecular Electron Density Theory (MEDT). Analysis of the Conceptual DFT indices allows the characterisation of the ambiphilic character of these cyclic AYs, thus participating as strong electrophiles and strong nucleophiles in polar 32CA reactions. The activation enthalpies associated with the 32CA reactions of these cyclic AYs are found in reasonable agreement with the experimental outcomes. These reactions proceed through a one‐step mechanism. The 32CA reactions with 1‐dimethylamino‐1‐propyne and dimethyl acetylenedicarboxylate take place through highly asynchronous polar transition states (TSs). On the other hand, the strain present in cyclooctyne allows explaining its participation in a non‐polar 32CA reaction via a synchronous TS. The present MEDT study allows establishing that the substitution in these cyclic AYs changes their parent pseudodiradical‐type reactivity to the zwitterionic‐type one.
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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 | 0.002 | 0.003 |
| 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.002 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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