Cover Picture: Mechanisms in the Reaction of Palladium(II)–π‐Allyl Complexes with Aryl Halides: Evidence for NHC Exchange Between Two Palladium Complexes (Chem. Eur. J. 29/2009)
Bibliographic record
Abstract
Migrating birds N-heterocyclic carbenes (NHCs) are known to form strong bonds with transition-metal complexes. In their Full paper on page 7063 ff., A. T. Normand, M. S. Nechaev, and K. J. Cavell describe a family of palladium(II) NHC complexes that undergo an autocatalytic reaction with aryl electrophiles in which no less than three PdNHC bonds are sequentially broken. The key step of this process is the concerted transfer of NHC and iodide ligands between two palladium complexes (see cover). This behavior is reminiscent of that of migrating birds, which have strong ties with their breeding grounds, but can travel away from them. In the case of NHCs, traveling too far can lead to a fatal issue if they “land” on a palladium complex from which reductive elimination can occur. Photography by Tim Holte, design by Joëlle Charpy. Nanopatterned Surfaces In their Review article on page 7004 ff., D. Bonifazi et al. discuss the construction of multifunctional organic materials by the use of nanotemplated surfaces featuring porous domains in which functional molecules can be precisely accommodated at the single-molecule level.1 α,β-Unsaturated Amidines In their Communication on page 7026 ff., N. Shindoh, Y. Takemoto, and K. Takasu describe the preparation of enantiomers of axially chiral α,β-unsaturated amidines and examine their dynamic chirality. In addition they report on a novel synthetic method for their preparation by means of a catalytic cascade reaction of ynamides and imines in a stereoselective manner.1 Acid–Base Interactions In their Full Paper on page 7052 ff., W. R. Thiel et al. describe the preparation of acid–base bifunctional mesoporous silica materials by co-condensation of tetraethoxysilane and silanes possessing amino and sulfonic acid groups. The samples showed increased catalytic activity for various one-step reaction cascades compared with homogeneous catalysts, and an acid–base cooperative activation mechanism is proposed.1
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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 | 0.002 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.000 | 0.003 |
| 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 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".