Rapid Ni, Zn, and Cu Ion-Promoted Alcoholysis of <i>N</i>,<i>N-</i>Bis(2-picolyl)- and <i>N</i>,<i>N-</i>Bis((1<i>H</i>-benzimidazol-2-yl)methyl)-<i>p</i>-nitrobenzamides in Methanol and Ethanol
Bibliographic record
Abstract
The methanolysis and ethanolysis of the Ni(II), Zn(II), and Cu(II) complexes of N,N-bis(2-picolyl)-p-nitrobenzamide (1) and N,N-bis((1H-benzimidazol-2-yl)methyl)-p-nitrobenzamide (2) were studied under pH-controlled conditions at 25 °C. Details of the mechanism were obtained from plots of the kobs values for the reaction under pseudo-first-order conditions as a function of [M2+]. Such plots give saturation kinetics for the Cu(II)-promoted reactions of 1 and 2 in both solvents, the Zn(II)-promoted reaction of 1 in methanol, and the Zn(II)- and Ni(II)-promoted reactions of 2 in methanol and ethanol. Logs of the maximal observed rate constants obtained from the latter plots, (kobs(max)), when plotted versus s(s)pH, are curved downward only for the Cu(II) complexes of 1 and 2 in both solvents and the Zn(II) complex of 1 in methanol. Despite differences in the metal-binding abilities and pKa values for formation of the active form, there is a common reaction mechanism, with the active form being 1:M(II):(–OR) and 2:M(II):(–OR), where M(II):(–OR) is the metal-bound alkoxide. The acceleration provided by the metal ion is substantial, being 10(14)–10(19) relative to the k2(¯OMe) value for the alkoxide-promoted alcoholysis of the uncomplexed amide.
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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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.002 | 0.002 |
| Meta-epidemiology (broad) | 0.003 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.002 | 0.003 |
| 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; both teacher heads agree on what is shown here.
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".