Neutral and Cationic Organoaluminum Complexes Utilizing a Novel Anilido−Phosphinimine Ancillary Ligand
Bibliographic record
Abstract
A new chelating N,N ligand family incorporating an anilido−phosphinimine donor set has been designed and an example prepared in multigram quantities in three steps using a convenient, modular synthetic approach. The ligand 1-(NHAr)-2-(PPh 2 NAr‘)C 6 H 4 ( 1·H; Ar = 2,6- i Pr 2 -C 6 H 3; Ar‘ = 2,4,5-Me 3 C 6 H 2 ) was prepared in three steps in a 30−35% overall yield and was fully characterized in its protio form as well as in the form of its lithium salt, 1·Li . In both compounds, the donor array assumes a conformation in which the P N moiety dips out of the plane formed by the four atoms in the rigid ortho-disubstituted aryl ring of the ligand backbone. The coordinating properties of the new ligand were demonstrated by the synthesis of some organoaluminum derivatives. The monomeric compounds LAlMe 2 ( 2 ) and LAlH 2 ( 3 ) were prepared by the reaction of 1·H with AlMe 3 and AlH 3 ·NMe 3, respectively, and were fully characterized by NMR spectroscopy and X-ray crystallography. Cationic derivatives were formed by activation of 2 and 3 with either B(C 6 F 5 ) 3 or [Ph 3 C] + [B(C 6 F 5 ) 4 ] - . All of the neutral and cationic compounds qualitatively exhibited high levels of stability in comparison to related organoaluminum compounds, illustrating the exemplary steric and electronic properties of the new ligand system.
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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 | 0.001 | 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".