Syntheses and Reactivity of Stannyloligosilanes. 2. Branched Stannyloligosilanes
Bibliographic record
Abstract
Branched tri(stannyl)tetrasilanes MeSi[SiMe 2 SnR 2 R‘] 3 ( 2, R = R‘ = Ph; 3, R = R‘ = Me; 5, R = t -Bu, R‘ = H) were synthesized by the reaction of alkali metal tri- or diorganostannides with methyltris(fluorodimethylsilyl)silane ( 1 ) or methyltris(chlorodimethylsilyl)silane ( 4 ) or by reacting triphenylchlorostannane with 1 in the presence of magnesium. Methyltris[(hydridodi- tert -butylstannyl)dimethylsilyl]silane ( 5 ) was halogenated at the tin atom by treatment with CHCl 3 or CHBr 3 . Surprisingly, the reaction of 5 with 3 equiv of lithium diisopropylamide (LDA) resulted in the formation of the five-membered ring 10 (2-dimethylsilyl-1,1,2,3,3-pentamethyl-4,4,5,5-tetra- tert -butyl-1,2,3-trisila-4,5-distannacyclopentane) with a bridging Sn−Sn unit. Reacting 5 with triethylamine or aminostannanes resulted in the formation of 2-dimethylsilyl-1,1,2,3,3-pentamethyl-4,4,5,6,6-penta- tert -butyl-1,2,3-trisila-4,5,6-tristannacyclohexane ( 14 ). The solid-state structures of 5 and 14b were determined by X-ray crystallography.
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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) | 0.003 | 0.001 |
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".