Overriding Norrish Type II to Access Cyclopropanols
Bibliographic record
Abstract
The propensity for photoexcited aryl ketones to undergo 1,5-hydrogen atom transfer (HAT) reactions is a fundamental process in organic synthesis and polymer degradation. Since its discovery in 1958, Norrish-Yang photocyclization has become a prominent method to access cyclobutanols under mild photoirradiative conditions. Despite its successful extension to larger ring systems, access to medicinally relevant 3-membered rings remains limited due to the strong kinetic preference for 1,5-HAT over 1,4-HAT. In this work, we demonstrate the first photocyclization of β-boryl aryl ketones to cyclopropanols. Our strategy relies on solvent-controlled selective population of the π,π* triplet state over the n,π* triplet state, with the former preferentially undergoing 1,4-boryl group transfer over 1,5-HAT. This protocol proceeds under mild irradiative conditions with excellent functional group tolerance, providing access to a broad range of highly valuable cyclopropanol scaffolds.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| 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".