Syntheses and Characterization of (C<sub>2</sub>F<sub>5</sub>)<sub>3</sub>BCO and (C<sub>3</sub>F<sub>7</sub>)<sub>3</sub>BCO
Bibliographic record
Abstract
The new tris(perfluoroalkyl)borane carbonyls, (C(2)F(5))(3)BCO and (C(3)F(7))(3)BCO, were prepared by means of a novel synthetic route using commercially available precursors by reacting K[(C(2)F(5))(3)BCOOH] and K[(C(3)F(7))(3)BCOOH] with concentrated sulfuric acid in the last step. The carboxylic acids, K[(C(2)F(5))(3)BCOOH] and K[(C(3)F(7))(3)BCOOH], were prepared by oxidative cleavage of the C[triple bond]C triple bonds in Cs[(C(2)F(5))(3)BC[triple bond]CPh] and Cs[(C(3)F(7))(3)BC[triple bond]CPh] in a two-step process to yield K[(C(2)F(5))(3)BCO-COPh] and K[(C(3)F(7))(3)BCO-COPh] as isolable intermediates. Crystal structures were obtained of K[(C(2)F(5))(3)BCO-COPh], K[(C(2)F(5))(3)BCOOH].H(2)O, (C(2)F(5))(3)BCO, K[(C(3)F(7))(3)BCOOH].2H(2)O, and (C(3)F(7))(3)BCO. In the crystal structures of (C(2)F(5))(3)BCO and (C(3)F(7))(3)BCO the C[triple bond]O bond lengths are 1.109(2) and 1.103(5) A, respectively, which are among the shortest observed to date. Tris(pentafluoroethyl)borane carbonyl and (C(3)F(7))(3)BCO slowly decompose at room temperature to yield CO, difluoroperfluoroalkylboranes and perfluoroalkenes. The decomposition of (C(2)F(5))(3)BCO was found to follow a first-order rate law with E(a)=107 kJ mol(-1).
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 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 | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".