Divalent Ytterbium and Iron Metallocenes of a Dimethyldihydropyrene-Fused Cyclopentadienyl
Bibliographic record
Abstract
The photoisomerizable, dimethyldihydropyrene-fused cyclopentadienide salt LiCpDHP reacts with FeCl 2 to form Fe(CpDHP) 2 ( 1 ). Reaction of the parent cyclopentadiene HCpDHP with Yb[N(SiMe 3 ) 2 ] 2 [THF] 2 similarly affords the bent ytterbium metallocene Yb(CpDHP) 2 (THF) 2 ( 3 ). Both metallocenes are formed as a mixture of rac and meso isomers in 3:2 and 1:1 ratios for Fe and Yb, respectively. NMR data are consistent with η 5 -coordination of the CpDHP ligand in 1, and this is also confirmed to be the case in 3 by X-ray crystallography. Attempts to oxidize the Yb(II) center in 3 with p -tolyldisulfide led to loss of the CpDHP ligand as the dimer (CpDHP) 2 . Photolysis of either 1 or 3 at wavelengths longer than 490 nm did not result in isomerization to the ring-opened cyclophanediene form of the ligand, in contrast to the lithium salt LiCpDHP.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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) | 0.016 | 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".