Yttrium and Aluminum Alkyl Complexes of a Rigid Bis-Anilido NON-Donor Ligand: Synthesis and Hydroamination Catalysis
Bibliographic record
Abstract
The palladium-catalyzed coupling of 4,5-dibromo-2,7-di- tert -butyl-9,9-dimethylxanthene (XBr 2 ) with 2 equiv of 2,4,6-triisopropylaniline afforded the proligand 4,5-bis(2,4,6-triisopropylanilino)-2,7-di- tert -butyl-9,9-dimethylxanthene (H 2 XN 2 ), and reaction of H 2 XN 2 with [Y(CH 2 SiMe 2 R) 3 (THF) 2 ] (R = Me, Ph) produced the monoalkyl yttrium complexes [(XN 2 )Y(CH 2 SiMe 2 R)(THF)] (R = Me ( 1a), Ph ( 1b )). Neutral 1a showed near-zero ethylene polymerization activity (1 atm, 20 and 80 °C), and in the presence of AlMe 3, 1a converted to [(XN 2 )Y{(μ-Me) 2 AlMe 2 }(THF)] ( 2 ). Compound 2 is thermally robust, and transfer of the XN 2 ligand from yttrium to aluminum was not observed even at elevated temperatures. However, [(XN 2 )AlMe] ( 3 ) was accessible via the reaction of H 2 XN 2 with AlMe 3, demonstrating the ability of the wide-bite-angle XN 2 ligand to coordinate to much smaller aluminum(III). Neutral 1a proved to be highly active for both intra- and intermolecular hydroamination with various substrates, yielding Markovnikov products in the intermolecular hydroamination reactions with 1-octene.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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".