Dehydrocoupling of Phosphine‐Borane Adducts Under Ambient Conditions Using Aminoboranes as Hydrogen Acceptors
Bibliographic record
Abstract
Abstract We report on the reactivity of aminoboranes (R 2 N=BH 2 ; R = i Pr, Et, Me) with phosphine‐borane adducts (PhR′PH ⋅ BH 3 ; R′ = H, Ph): Sufficiently sterically unencumbered aminoboranes can accept hydrogen from phosphine‐borane adducts. The hydrogen transfer results in the formation of amine‐borane adducts (R 2 NH ⋅ BH 3 ) and transient phosphinoboranes (PhR′P−BH 2 ) in situ . These phosphinoboranes undergo subsequent reactivity to yield either polyphosphinoborane, [PhPH−BH 2 ] n , or the linear dimer, Ph 2 PH ⋅ BH 2 −Ph 2 P ⋅ BH 3 . Unlike metal catalyzed phosphine‐borane dehydrocoupling, which occurs at elevated temperatures (2 M, toluene, ≥100 °C, ≥24 h), these dehydrocoupling reactions occur under ambient conditions (2 M, Et 2 O or C 6 D 6 , 20 °C, ≤24 h). We performed a computational mechanistic study in which we identified that this transformation potentially occurs via a P‐to‐N and B‐to‐B hydrogen transfer through a 6‐membered transition state.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 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".