Geometrical distortions and charge transfer in munchnöne regio‐selectivity: A conceptual density functional study
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Bibliographic record
Abstract
Dipolar cycloaddition reactions involving munchnönes and simple dipolarophiles provide a versatile synthetic route toward pyrrole derivatives. However, despite their widespread use, there are still debates regarding the factors governing the regio‐selectivity of these reactions. In this contribution, we study the regio‐selectivity of 1,3‐dipolar cycloadditions of munchnönes and alkenes, and the ability of conceptual density functional theory (c‐DFT) descriptors to correctly study these processes. We base our analysis on the variation of different reactivity descriptors along the reaction path, calculated for the whole reacting complex, and for the isolated species, with the strained geometries they present within this supra‐molecular aggregate. The study of several global descriptors indicates that the path leading to the preferred product proceeds via an asynchronous mechanism, with the maximum extent of charge transfer occurring after the transition state. This helps to understand why several reactivity principles fail to correctly account for the position of the transition state in this case. This also explains why local c‐DFT descriptors fail to predict the observed majoritarian regio‐isomer. These results highlight the fundamental role of the distortion effects for determining the extent of charge transfer between the reactants, and thus their impact on the reactivity and regio‐selectivity in these reactions.
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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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 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 it