The Impact of a Hemilabile Phosphine Donor on the Ring Opening Polymerization of Cyclic Esters by Zinc Catalysts
Bibliographic record
Abstract
Abstract Hemilabile ligands have the potential to tune catalyst reactivity and selectivity in myriad ways. In this study, we explore the role of phosphine donors on the reactivity of zinc catalysts for the polymerization of rac ‐lactide and ε‐caprolactone. We report the synthesis of a series of zinc complexes supported by an amino‐phenolate ligand bearing a phosphine arm. Systematic comparisons between complexes with and without the hemilabile phosphine functionality reveal distinct differences in polymerization between rac ‐lactide and ε‐caprolactone. Combined analysis of polymerization data and kinetic studies demonstrates that the phosphine arm provides essential steric bulk to the catalyst to maintain a mononuclear solution‐phase structure.
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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 | 0.000 | 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 | 0.001 | 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".