Structures and CO<sub>2</sub> Reactivity of Zinc Complexes of Bis(diisopropyl-) and Bis(diphenylphosphino)amines
Bibliographic record
Abstract
The bis(phosphino)amines (R 2 P)NH(PR′ 2 ) (R = R′ = isopropyl; R = R′ = phenyl; R = isopropyl, R′ = phenyl) react with ZnEt 2 to form complexes with two different structural motifs, either the homoleptic monomeric P,P-chelates Zn[N( i -Pr 2 P) 2 ] 2 and Zn[N( i -Pr 2 P)(Ph 2 P)] 2 or the heteroleptic dimeric Zn 2 N 2 P 2 heterocycles {EtZn[N(PPh 2 ) 2 ]} 2 and {EtZn[N(PPh 2 )( i -Pr 2 P)]} 2 . In two cases, CO 2 reacts with these complexes to give adducts Zn[O 2 CP( i -Pr 2 )NP( i -Pr 2 )] 2 and Zn[O 2 CP( i -Pr 2 )NPPh 2 ][Ph 2 PN( i -Pr 2 P)]ZnEt 2, similar to adducts formed from the reaction of CO 2 with frustrated Lewis pairs (FLPs). In the other two cases, reaction with CO 2 results in cleavage and rearrangement of the N–P bonds to give either N(PPh 2 ) 3 or Ph 2 P( i Pr 2 P)NPPh 2 . The zinc complexes and their CO 2 products were characterized with a combination of single crystal X-ray diffraction and multinuclear NMR spectroscopy.
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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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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".