A Kinetics Study of the Oxidative Addition of Bromobenzene to Pd(PCy<sub>3</sub>)<sub>2</sub>(Cy = cyclohexyl) in a Nonpolar Medium: The Influence on Rates of Added PCy<sub>3</sub>and Bromide Ion
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Bibliographic record
Abstract
Bromobenzene oxidatively adds to the palladium(0) compound Pd(PCy 3 ) 2 to give cleanly the palladium(II) product trans -PdBr(Ph)(PCy 3 ) 2 . Kinetics studies of this reaction under pseudo-first-order conditions (excess PhBr) as well as in the presence of 1 molar equiv of PCy 3 or of added bromide ion (as the toluene-soluble tetraoctylphosphonium salt) have been carried out. We find that oxidative addition is first-order in palladium and that, in the absence of added PCy 3, the reaction involves both the 2:1 species Pd(PCy 3 ) 2 and the 1:1 species Pd(PCy 3 ). Interestingly, added PCy 3 results in inhibition of oxidative addition both by decreasing the relative amount of the reactive 1:1 compound and by converting much of the palladium(0) to the kinetically less active 3:1 compound Pd(PCy 3 ) 3 . Added bromide ion has essentially no effect on the rate, surprising in view of previous literature reports.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.002 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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 it