Ammonium and Potassium Salts of a Hexacoordinate Phosphorus(V) Anion Featuring P–O and P–C Bonds
Bibliographic record
Abstract
Ammonium and potassium salts featuring the chiral mer -[P(C 6 H 4 CO 2 ) 3 ] −, mer -[ 1 ] −, have been isolated. Specifically, treating phosphorane P(C 6 H 4 CO 2 ) 2 (C 6 H 4 CO 2 H), 2, with N-containing bases [N base = PhNMe 2, PhNH 2, pyridine (py), isoquinoline, (−)-brucine, N( n -C 8 H 17 ) 3 ] afforded ammonium salts [N base H] + - mer -[ 1 ] − . Each compound was fully characterized spectroscopically, and four were subjected to X-ray crystallographic analysis. Salts were isolated with the racemic mixture of the mer -[ 1 ] − anion except in the case of [(−)-brucineH]-Λ- mer -[ 1 ], for which the crystal analyzed was enantiomerically pure. The potassium salt, K- mer -[ 1 ], was synthesized by treating 2 with KH. The solid-state structure of K- mer -[ 1 ] is a coordination polymer consisting of seven- and eight-coordinate K + ions that are weakly bound by oxygen of either the racemic anion or the methanol solvent. Preliminary NMR and MS data for the formation of the Brønsted acid, H(DMF) n [ 1 ], has also been obtained. An estimate of the basicity of anion mer -[ 1 ] − was obtained from IR measurements of the N–H stretching frequency for [( n -C 8 H 17 ) 3 NH]- mer -[ 1 ]. On the basis of these measurements, anion mer -[ 1 ] − was ranked similar to the classical weakly coordinating anion, [ClO 4 ] −, in terms of its coordinating ability.
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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) | 0.001 | 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 | 0.001 |
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 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".