Zirconium Complexes of Symmetric and of Chiral Diketiminate Ligands: Synthesis, Crystal Structures, and Reactivities
Bibliographic record
Abstract
Reaction of N, N -dialkyl-2-amino-4-iminopent-2-enes ( nacnac R H; R = Bn ( 1a ), Cy ( 1b ), R -CH(Me)Ph ( 1c )) with n BuLi afforded the lithium salts nacnac R Li(THF), 2a − c . Further reaction with ZrCl 4 or ZrCl 4 (THF) 2 yielded the cis -dichloride complexes nacnac R 2 ZrCl 2, 3a − c . As a side reaction in the synthesis of 3c, CH activation of CH(Me)Ph under formal HCl elimination was observed. Complex 3a could also be obtained by reaction of nacnac Bn H with n Bu 2 ZrCl 2 . nacnac Bn 2 ZrMe 2, 5, was formed in reactions of 3a with MeLi in the presence of excess AlMe 3 and was isolated from the reaction of Me 2 ZrCl 2 with 2a . Complex 5 reacts with aluminum chloride compounds, but not with lithium chloride, to form the dichloride complex 3a and with ethanol to form nacnac Bn 2 Zr(OEt) 2, 6 . X-ray diffraction studies have been performed for 3a − c, 5, and 6 .
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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 | 0.001 | 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".