Synthesis, characterization, and polycondensation of new stable α,ω-organo(bis-silanediols)
Bibliographic record
Abstract
The synthesis and characterization of stable bis(dihydroxymethylsilyl) derivatives are described. These compounds were obtained as microcrystalline powders by controlled hydrolysis in a biphasic medium (ethyl ether water) of the corresponding bis(dimethoxymethylsilyl) organic precursors containing phenyl, biphenyl, stilbenyl, diphenyl acetylene, and diphenylbut-1,3-diyne groups. All the solids obtained exhibited a layered structure. Condensation of the bis-silanediols could be effected by fluoride catalysis in solution at ambient temperature or simply by heating in solid state. The polysiloxanes obtained from the bis-silanediols have been compared with those obtained by hydrolysispolycondensation of the corresponding bis-dimethoxysilanes. The thermal route led to highly polycondensed solids arranged into thin plates as evidenced by TEM analysis; furthermore, in the case of the longer spacer, the organization was controlled by the arrangement of the Si-O-Si layers instead of the spacer. The X-ray study of these materials clearly evidenced the drastic influence of the length of the organic spacer, the polycondensation route and the nature of the leaving group (hydroxy or methoxy) on the short-range organization of the solids. Key words: silanols, hybrid materials, polycondensation, polysiloxanes.
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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 | 0.001 |
| 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) | 0.003 | 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".