Stereochemistry of Disilanylene-Containing Cyclic Compounds. Synthesis and Reactions of<i>cis</i>- and<i>trans</i>-1,2-Dimethyl-1,2-diphenyl-1,2-disilacyclopentanes
Bibliographic record
Abstract
The Wurtz type coupling of a mixture of meso - and dl -1,3-bis(chloromethylphenylsilyl)propanes with sodium metal afforded a mixture of cis - and trans -disilacyclopentanes ( 1a and 1b ) in a ratio of 1:1. Pure 1a and 1b obtained by fractional distillation reacted with molecular oxygen in the presence of AIBN stereospecifically to give the respective cis - and trans -cyclic siloxanes ( 2a and 2b ), with retention of configuration. The reactions of 1a and 1b with MCPBA produced cleanly 2a and 2b in high yields, respectively. The palladium-catalyzed reactions of 1a and 1b with phenylacetylene gave stereospecifically cis - and trans -1,4-dimethyl-1,2,4-triphenyl-1,4-disilacyclohept-2-enes ( 3a and 3b ), in high yields. Similar treatment of 1a and 1b with diphenylacetylene also proceeded with high stereospecificity to give cis - and trans -1,4-dimethyl-1,2,3,4-tetraphenyl-1,4-disilacyclohept-2-enes ( 4a and 4b ), respectively. The results of an X-ray crystallographic study for products 4a and 4b are described.
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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) | 0.002 | 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".