Bibliographic record
Abstract
[18143-30-1] C5H14SSi (MW 134.32) InChI = 1S/C5H14SSi/c1-7(2,3)5-4-6/h6H,4-5H2,1-3H3 InChIKey = BCOLNMGFOWHFNI-UHFFFAOYSA-N (reagent used as a monoprotected sulfide dianion equivalent for the two-step installation of a divalent sulfur atom into organic molecules) Physical Data: bp 144–146 °C [52–54 °C (25 Torr)]; d 0.850. Solubility: soluble in MeOH, CH2Cl2, THF, and most organic solvents. Form Supplied in: liquid from major research chemical suppliers at a cost of ca. US$60/g (7.4 mmol) of 97% pure material. Analysis of Reagent Purity: GC. Preparative Methods: the high commercial cost of 2-(trimethylsilyl)ethanethiol necessitates methods for its lab scale synthesis. The radical addition of thiolacetic acid to vinyltrimethylsilane occurs thermally to afford a 9:1 ratio of regioisomers, the 1- and 2-(trimethylsilyl)ethyl thiolesters of acetic acid (eq 1).2, 3 Photochemical initiation may improve the ratio of regioisomers obtained.4 Purification of the thiolacetate by careful fractional distillation should be performed prior to conversion to the thiol in order to ensure high purity. The conversion to thiol is best performed with LAH3 or methanolic K2CO3,2 but ammonolysis may also be suitable.5 Saponification with KOH in water/ethanol is slightly less efficient.4 Direct radical addition of liquid H2S to vinyl trimethylsilane has been demonstrated, but the procedure is low-yielding and inconvenient.4 (1) Purification: distillation. Handling, Storage, and Precautions: the thiol possesses a strong unpleasant aroma that combines the characteristic olfactory features of thiol and low molecular weight silane. As a thiol, the reagent is incompatible with oxygen, base, and common oxidants. Distillation should be carried out with care since uncontrollable frothing may occur under reduced pressure, even with vigorous stirring.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.074 | 0.083 |
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".