Thermal Ring-Opening Polymerization of Planar-Chiral Sila[1]ferrocenophanes
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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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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) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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 it