Density Functional Study of the Proline-Catalyzed Direct Aldol Reaction
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Bibliographic record
Abstract
The proline-catalyzed direct aldol reaction between acetone and acetaldehyde has been investigated using density functional theory. Proline catalyzes the reaction according to the enamine mechanism characteristic of the natural class I aldolase enzymes. Although it has been postulated that the rate-limiting step in the proposed mechanism is enamine and/or C−C bond formation, the initial reaction between proline and acetone is accompanied by a very large barrier which may inhibit further progression of the reaction. However, an alternative lower energy reaction pathway is utilized when the ionizing solvent DMSO is present to assist in the formation and stabilization of separated charges. The direct aldol reaction between acetone and acetaldehyde illustrates the catalytic potential of simple organic molecules in asymmetric synthesis.
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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 | 0.000 |
| 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) | 0.000 | 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 it