Transient Chemical Oscillations in the 4‐(<i>N</i>,<i>N</i>‐Dimethylamino) Benzoic Acid–Bromate Reaction
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Bibliographic record
Abstract
ABSTRACT The bromination and oxidation of 4‐( N , N ‐dimethylamino) benzoic acid (DMABA) by acidic bromate was investigated in a batch reactor through following their redox potential and UV/vis absorption spectra, in which transient oscillations with a long induction time were observed. Different from most of the bromate‐aromatic compound oscillators reported earlier, the addition of metal catalysts such as manganese, cerium, and ferroin does not significantly affect the nonlinear phenomena, but the induction time could be greatly shortened by adding bromide ions as a starting reagent. The reaction between bromine and DMABA was identified through 1 H NMR spectroscopy to form 3‐bromo‐4‐( N , N ‐dimethylamino) benzoic acid. The compound 3‐bromo‐DMABA was also found to occur relatively early during the bromate‐DMABA reaction and was determined to be a major component prior to the onset of oscillations. Periodic evolution of 3‐bromo‐4‐( N , N ‐dimethylamino) benzoic acid has been detected with a UV/vis spectrophotometer.
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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 | 0.001 | 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 | 0.001 | 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