Bibliographic record
Abstract
[11135-81-2] Na2K/SiO2 InChI = 1S/K.2Na InChIKey = NSIKFNOYIGGILA-UHFFFAOYSA-N (alternative reagent used for alkali metal-mediated Birch reduction of aromatic hydrocarbons and aryl halides; reductive deallylation, debenzylation, and desulfonation of amines; reductive cleavage of triarylphosphines) Physical Data: autoignition temperature 120–125 °C, d 0.87 g mL−1 at 25 °C. Solubility: not applicable. Form Supplied in: black powder (35–60 mesh), 35–40% alkali metal in silica gel; available from major fine chemical suppliers. Purification: not applicable. Handling, Storage, and Precautions: depending on the reducing ability of the reagent (Stage 0, I, and II), its air sensitivity as well as its handling issues vary and should be taken into consideration for personal safety. Stage 0 powder should be handled in a glove box under inert atmosphere to avoid self-ignition in the presence of high humidity. Stage I powder is dry and air stable and can be stored up to 8 months in regular vials without losing its reducing power. On the other hand, Stage II powder can be readily handled in open air and can retain its reducing capacity for an extended period of time. While the reactivity of these reagents decreases from Stage 0 to Stage II, all three react with water quantitatively to liberate hydrogen gas. They are all incompatible with acids and oxidizing agents.
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 | 0.000 | 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 | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.018 | 0.020 |
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".