1,1′-Binaphthyl-2-[di(<i>tert</i>)-butyl]phosphine
Bibliographic record
Abstract
[255836-67-0] C28H31P (MW 398.52) InChI = 1S/C28H31P/c1-27(2,3)29(28(4,5)6)25-19-18-21-13-8-10-16-23(21)26(25)24-17-11-14-20-12-7-9-15-22(20)24/h7-19H,1-6H3 InChIKey = QGBQGMHXBSLYLZ-UHFFFAOYSA-N (reagent used as ligand in palladium-catalyzed CO, CN, and CC bond forming reactions) Physical Data: mp 147–149 °C. Solubility: soluble in most organic solvents. Form Supplied in: white crystalline solid, commercially available. Analysis of Reagent Purity: 1H and 31P NMR. Purification: typically used as obtained from commercial sources. Preparative Method: 1,1′-binaphthyl-2-[di(tert)-butyl]phosphine 1 is synthesized from 2-bromo-1,1′-binaphthyl. Treatment with magnesium turnings and subsequent transmetalation with CuCl followed by phosphinylation with di-tert-butylchlorophosphine provides pure 1 after recrystallization from ethanol (eq 1).3 (1) Handling, Storage, and Precautions: moderately stable under aerobic conditions. Long-term storage under argon or nitrogen atmosphere is recommended. Irritating to skin, eyes, and mucous membrane. Long-term effects are unknown.
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How this classification was reachedexpand
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 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.002 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.023 | 0.001 |
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 teacher head, 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".