Synthesis and X-ray Structures of Bis-Functional Resorcinarene Crown Ethers
Bibliographic record
Abstract
High Resolution Image Download MS PowerPoint Slide Two resorcin[4]arene-crowns were synthesized with crown ether substituents as the lower rim functionalities, with either the Crown-6 ( TRC6 ) or Crown-7 ( TRC7 ) moieties being incorporated. X-ray crystallographic data show that both molecules prefer the boat conformation in the solid state. The crown ethers were observed in an askew anti -arrangement in TRC6 and a syn -arrangement in TRC7 . TRC6 crystallized with four DMF and four H 2 O molecules. Two of the DMF solvent molecules are hydrogen bonded to the resorcinolic OHs, and the other two are entrapped as a dimer between two ether moieties from adjacent TRC6 molecules. In TRC7, four intramolecular hydrogen bonds from the same resorcinol OH group to the crown ether oxygens are observed, with O···O contact distances of 2.742(2) Å and 2.872(2) Å and O–H···O angles of 169.8° and 175.4°. Host–guest binding of potassium and rubidium cations as their chloride and tetrafluoroborate salts in highly competitive DMSO shows 1:1 and 1:2 host–guest complexes for TRC6 and TRC7, respectively. More intense NMR signal changes were observed in less competitive acetonitrile solvent with the tetrafluoroborate salts.
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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 | 0.000 | 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 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".