Thermal Ring-Opening Polymerization of Planar-Chiral Sila[1]ferrocenophanes
Bibliographic record
Abstract
The new Me 2 Si-bridged [1]ferrocenophane ([1]FCP) with one i Pr group in α position on a Cp ring was synthesized in an enantiopure ( S p - 4 ) and a racemic form ( rac - 4 ). The molecular structure of rac - 4 was determined by single-crystal X-ray analysis (tilt angle α = 20.15(14)°). Experimental and calculated molecular structures of the related [1]FCPs with one ( S p - 4 and rac - 4 ) or two i Pr groups ( S p, S p - 4 ) are compared to that of the nonsubstituted [1]FCP Me 2 Sifc. Differential scanning calorimetry (DSC) measurements resulted in Δ H ROP of −72(±2) kJ mol –1 for rac- 4 and −62(±2) kJ mol –1 for the known S p, S p - 4 . While thermal ring-opening polymerization of S p, S p - 4 gave insoluble material, the monosubstituted monomers S p - 4 and rac- 4 resulted in soluble polymers with molecular weights ( M w ) of 5.3 × 10 6 and 2.6 × 10 6 Da, respectively. Investigation of the polymer structures by 29 Si NMR spectroscopy gave further evidence that the breakage of Si–Cp bonds occurs in the thermal ROP process of sila[1]ferrocenophanes.
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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) | 0.001 | 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".