2-(Diphenylphosphino)-2′-(<i>N</i>,<i>N</i>-dimethylamino)-biphenyl
Bibliographic record
Abstract
2-(Diphenylphosphino)-2′-(N,N-dimethylamino)-biphenyl (Ph-Davephos) [240417-00-9] C26H24NP (MW 381.4492) InChI = 1S/C26H24NP/c1-27(2)25-19-11-9-17-23(25)24-18-10-12-20-26(24)28(21-13-5-3-6-14-21)22-15-7-4-8-16-22/h3-20H,1-2H3 InChIKey = JGFXUYLYPITYGR-UHFFFAOYSA-N (phenyl version of Davephos; ligand used for various cross-coupling reactions) Physical Data: mp 124–126 °C.1 Form Supplied in: white powder. Preparation: in 2004, a synthesis of the Ph-Davephos ligand from 2-bromo-iodobenzene was reported in a four-step process with an overall yield of 43%.2 The compound can also be obtained in high yields through the reduction of the corresponding phosphine oxide using DIBAL-H.1 The original Buchwald-type biaryl ligands were prepared using a four-step process starting from 2-bromo-aniline with an overall yield of 29%.3 This synthesis was further optimized to a large scale, one-pot process via the intermediate generation of benzyne.4 Handling, Storage, and Precautions: air sensitive, keep stored under inert gas and in a dry place. Hazardous decomposition products formed under fire conditions.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.013 | 0.009 |
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".