Diazene Chemistry: Metal-Free Models of N<sub>2</sub> Reduction Intermediates
Bibliographic record
Abstract
Interest in main group chemistry related to the Haber–Bosch process has drawn less attention than that of transition metal species. Herein, we show that the steric demands in ( t BuO 2 CN) 2 block initial interaction of B(C 6 F 5 ) 3 with nitrogen and prompt loss of methylpropene and CO 2 to diazene (N 2 H 2 ) borane adduct 1 and the analogous hydrazine (N 2 H 4 ) adduct 2 . These species react with basic phosphines to give anions of 3 and 5 containing N 2 H and N 2 H 3 fragments, respectively. While these species are not derived directly from N 2, they represent metal-free species containing N 2 H n ( n = 1–4) fragments, which model plausible intermediates in the reduction of N 2 .
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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) | 0.000 | 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 | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 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 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".