Double and Reversible Alkyl Transfer from ZrBn<sub>4</sub>/HfBn<sub>4</sub> to a Diiminepyridine Ligand
Bibliographic record
Abstract
Reaction of MBn 4 (M = Zr, Hf) with diiminepyridine ligands Me DIP, Et DIP and i Pr DIP [ R DIP = 2,6‐(2,6‐R 2 C 6 H 3 N=CMe) 2 ‐C 5 H 3 N] results in the transfer of two benzyl groups to the DIP imine carbon atoms, generating mixtures of rac and meso isomers of [ R DIP + 2Bn]MBn 2 . The diastereomers could in several cases be separated by fractional crystallization, and the X‐ray structures of rac and meso [ Et DIP + 2Bn]ZrBn 2 , meso ‐[ Me DIP + 2Bn]ZrBn 2 and meso ‐[ Et DIP + 2Bn]HfBn 2 are reported. On heating either diastereomer of [ Et DIP + 2Bn]ZrBn 2 in solution, the other isomer grows back in, demonstrating reversibility of the alkyl transfer. Transfer to other positions of the DIP skeleton was not observed. The reaction of [ Et DIP + 2Bn]ZrBn 2 with two equivalents of TEMPO produced structurally characterized [ Et DIP + 2Bn]Zr(Bn)(TEMPO) which shows no tendency to isomerize.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 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".