Acid-catalyzed hydrolysis of the vinyl ether group of 4-methoxy-1,2-dihydronaphthalene. Effect of conformation on reactivity
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Bibliographic record
Abstract
Rates of acid-catalyzed hydrolysis of the vinyl ether group of 4-methoxy-1,2-dihydronaphthalene were measured in dilute aqueous perchloric acid solutions and also in a series of carboxylic acid buffers. These data give the hydronium-ion isotope effect k H /k D = 3.39 and provide a Brnsted relation with the exponent = 0.70. The hydronium ion catalytic coefficient for this reaction is less, by a factor of 2.4, than that for the corresponding reaction of 3-methoxyindene. This rate difference is consistent with the coplanar arrangement of the vinyl and benzene groups in indene but non-coplanar disposition of these groups in dihydronaphthalene, and the consequent reduced ability of the benzene ring of dihydronaphthalene to stabilize the adjacent positive charge being put there in the rate-determining step of the vinyl ether hydrolysis rreaction.
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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) | 0.001 | 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.
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