One-Pot Conversion of Thebaine to Hydrocodone and Synthesis of Neopinone Ketal
Bibliographic record
Abstract
The ethylene glycol ketal of neopinone was prepared in a one-pot procedure by the reaction of thebaine with ethylene glyocol in the presence of p-toluenesulfonic acid. The ketal is also an intermediate in the conversion of thebaine to hydrocodone with ethylene glycol and Pd(OAc)(2), followed by hydrogenation. Additionally, a one-pot procedure for the conversion of thebaine to hydrocodone was achieved by employing palladium catalysis in aqueous medium. Palladium serves a dual purpose in this transformation, first for the activation of the dienol ether of thebaine and second as a hydrogenation catalyst. This procedure was found to be comparable to the two-step protocol which employs diimide reduction of thebaine followed by acid-catalyzed hydrolysis of the resulting 8,14-dihydrothebaine to hydrocodone. Experimental and spectral data are provided for all compounds.
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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) | 0.001 | 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) | 0.001 | 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".