The relative stabilities of Ph<i>E</i>(NH<i>-t-</i>Bu)<sub>2</sub> and Ph<i>E</i>(μ-N<i>-t-</i>Bu)<sub>2</sub><i>E</i>Ph (<i>E</i> = As, Sb, and Bi): X-ray structures of {Li<sub>2</sub>[PhAs(N<i>-t-</i>Bu)<sub>2</sub>]}<sub>2</sub> and Ph<i>E</i>(μ-N<i>-t-</i>Bu)<sub>2</sub><i>E</i>Ph (<i>E</i> = Sb, Bi)
Bibliographic record
Abstract
The reaction of PhECl 2 with 2 equiv of LiHN-t-Bu has been studied for the series E = As, Sb, and Bi to determine the effect of the phenyl group on subsequent amine condensation processes. For PhAsCl 2 , the metathesis product PhAs(NH-t-Bu) 2 4 was obtained as a colourless oil. Similar reactions involving PhECl 2 , where E = Sb or Bi, yielded the cyclodipnict(III)azanes PhE(μ-N-t-Bu) 2 EPh 5 (E = Sb) and 6 (E = Bi), respectively. Treatment of 4 with 2 equiv of n-BuLi produced the dilithium salt Li 2 [PhAs(N-t-Bu) 2 ] 7a. Products 4, 5, 6, and 7a were characterized by 1 H, 7 Li (7a), and 13 C NMR spectra, while 5, 6, and 7a were also structurally characterized by X-ray crystallography. Compound 7a is dimeric in the solid state via intermolecular Li···N and η 6 -Li···Ph interactions. The cyclodipnict(III)azanes 5 and 6 have similar structures, with the exocyclic phenyl groups in trans positions relative to the E 2 N 2 ring. This synthetic approach provides a new route to the four-membered rings RE(μ-N-t-Bu) 2 ER (E = Sb, Bi) and the first example of a bis(organyl)cyclodibism(III)azane.Key words: arsenic, antimony, bismuth, amides, imides.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
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 | 0.006 | 0.006 |
| Meta-epidemiology (narrow) | 0.008 | 0.008 |
| Meta-epidemiology (broad) | 0.008 | 0.004 |
| Bibliometrics | 0.002 | 0.005 |
| Science and technology studies | 0.004 | 0.010 |
| Scholarly communication | 0.002 | 0.005 |
| Open science | 0.005 | 0.002 |
| Research integrity | 0.005 | 0.010 |
| Insufficient payload (model declined to judge) | 0.000 | 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; both teacher heads agree on what is shown here.
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".