2,2-Dimethyl-5-[3-(diphenylstannyl) propyl]-1,3-dioxolan-4-one
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
[410098-22-5] C20H24O3Sn (MW 431.10) InChI = 1S/C8H13O3.2C6H5.Sn.H/c1-4-5-6-7(9)11-8(2,3)10-6;2*1-2-4-6-5-3-1;;/h6H,1,4-5H2,2-3H3;2*1-5H;; InChIKey = PUVIBBRSMWZAIC-UHFFFAOYSA-N (title reagent behaves similar to Bu3SnH and Ph3SnH in standard free radical reactions,1 but the tin-containing by-products can be removed easily from the desired reaction products by mild hydrolysis under basic or acidic conditions1) Physical Data: colorless oil. Solubility: soluble in common organic solvents; usually used in benzene or toluene. Preparative Methods: 2-hydroxy-4-pentenoic acid,2 prepared from glyoxylic acid hydrate, is ketalized using 2,2-dimethoxypropane and TsOH·pyridine; the ketal is hydrostannylated by heating with an excess of triphenyltin hydride, and treatment of the resulting stannane with 1 equiv of I2,3 followed by reduction with sodium borohydride, gives the title compound. Purification: rapid flash chromatography over silica gel, using 1:4 ethyl acetate–hexane, affords the stannane as a colorless oil.1 Handling, Storage, and Precautions: the compound can be stored1 for several months in a freezer (−10 °C) in a sealed flask flushed with nitrogen, without significant decomposition, and is easily repurified, if necessary, by flash chromatography. The toxicity of this compound has not been studied and, as a precaution, work with this compound should be done in a fume hood and skin contact should be avoided.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.033 | 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