Electronically and Sterically Varied Vanadium Aminopyridinate Complexes Applied to the Catalytic Reductive Coupling of Alcohols
Bibliographic record
Abstract
2-Aminopyridinate complexes of vanadium were synthesized, isolated, and characterized. Comparative reactivity showed that 2-aminopyridinate ligands can be used in the synthesis of monometallic complexes and DFT calculations indicate increased electron donation for the 2-aminopyridinate ligand on vanadium compared to pyridonate ligands. A homoleptic, monometallic tris( N -phenyl-2-aminopyridinate)vanadium(III) complex was used for the catalytic reductive coupling of benzhydrol, and a series of various 2-aminopyridinate ligands were also screened for this transformation. Unsubstituted 2-aminopyridine as the proligand resulted in the highest activity, with the in situ catalytic system demonstrating improved reactivity with benzylic and allylic alcohols compared to previously reported systems. The isolation of the vanadium aminopyridinate complexes, coupled with kinetic investigations, supports monometallic intermediates for the catalytic reductive coupling of alcohols.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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)
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 source (direct Gemma or distilled Codex), 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".