Octa- and Nonamethylfluorene and an Electron-Rich Permethylfluorenyl Ruthenocene Derivative
Bibliographic record
Abstract
Two highly methylated fluorene derivatives have been synthesized and used for the preparation of mixed-ligand fluorenyl ruthenocenes. Specifically, reaction of 2,2‘,3,3‘,4,4‘,5,5‘-octamethylbiphenyl with paraformaldehyde in the presence of CF 3 CO 2 H provided 1,2,3,4,5,6,7,8-octamethylfluorene (C 13 Me 8 H 2 ), which was subsequently methylated by reaction with n -BuLi followed by addition of MeI to yield 1,2,3,4,5,6,7,8,9-nonamethylfluorene (C 13 Me 9 H). Reaction of the lithium fluorenyl derivatives with [Cp*RuCl] 4 generated the mixed-ligand ruthenocenes Cp*(C 13 Me 8 H)Ru and Cp*(C 13 Me 9 )Ru. Electrochemical measurements indicate that these ruthenocene derivatives undergo quasi-reversible oxidations at low potentials consistent with strongly donating character for the highly methylated fluorenyl ligands. X-ray diffraction studies on C 13 Me 8 H 2, C 13 Me 9 H, and Cp*(C 13 Me 9 )Ru revealed a twisted fluorene core in all cases.
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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 | 0.000 |
| 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) | 0.008 | 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".