(Methoxycarbonylmethylene)triphenylphosphorane
Why this work is in the frame
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Bibliographic record
Abstract
[2605-67-6] C21H19O2P (MW 334.37) InChI = 1S/C21H19O2P/c1-23-21(22)17-24(18-11-5-2-6-12-18,19-13-7-3-8-14-19)20-15-9-4-10-16-20/h2-17H,1H3 InChIKey = NTNUDYROPUKXNA-UHFFFAOYSA-N (stabilized phosphorane reagent useful for Wittig alkenation reactions to give methyl acrylate esters on reactions with carbonyl compounds1 and ozonides;2 formation of heterocyclic rings3) Alternate Name: methyl (triphenylphosphoranylidene)acetate. Physical Data: mp 169–171 °C. Solubility: sol CHCl3 (26 g 100 mL−1); slightly sol EtOH (2.7 g 100 mL−1), THF (3.8 g 100 mL−1); insol water (<0.5 g 100 mL−1). Form Supplied in: white crystalline powder; commercially available. Preparative Methods: readily prepared by mild base treatment of (methoxycarbonylmethyl)triphenylphosphonium bromide (pKa 8.8) (eq 1).4, 5 (1) Handling, Storage, and Precautions: storage at 5 °C in a tightly sealed bottle is recommended for prolonged periods. The compound decomposes to triphenylphosphine oxide in MeOH–water 1∶1 (t1/2 ca. 1.5 h) and in weakly basic aqueous solution (0.5 mM NaOH in MeOH–water 1∶1) (t1/2 ca. 1 h).
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.
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 | 0.001 | 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 | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.011 | 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