Highly Congested Donor–Acceptor P–B Compound: Synthesis and Properties of a BMes<sub>2</sub>- and a PPh<sub>2</sub>-Functionalized 1,8-Naphthalene
Bibliographic record
Abstract
A PPh 2 - and BMes 2 -functionalized (Mes = mesityl) 1,8-naphthalene molecule ( 1 ) has been synthesized and fully characterized. Compound 1 is a highly congested molecule with a P–B dative bond. NMR studies support that the P–B bond in 1 is persistent in solution. Compound 1 is thermally and photochemically stable. It is highly fluxional in solution. The only reactivity it displays is its reactions with halogen molecules (PhI·Cl 2 and I 2 ), leading to the isolation of a hydrolyzed product 2, in which an oxygen atom is inserted between the P and B atom. The crystal structures of 1 and 2 have been determined by single-crystal X-ray diffraction analyses. A DFT computational study established that the open form of 1 has a P–B separation distance of 3.00 Å, much longer than the closed one (2.23 Å). Furthermore, a computational study showed that the energy difference between the two forms is very small, ∼1 kcal/mol, which can be attributed to the highly congested nature of the molecule.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 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 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".