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 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) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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".