Rapid Microwave-Assisted Synthesis of .γ-Phosphonic Acid Quaternary Ammonium Antimicrobials for Biomedical Applications
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Bibliographic record
Abstract
Novel water soluble γ-phosphonates and phosphonic acid quaternary ammonium compounds (QAC) with different alkyl chain lengths, a dansyl (DNS) fluorescent tag ([RN+Me2(CH2)3P(O)(OR1)2]Br-; R = CH3, C18H37, -DNS-NH- (CH2)3; R1 = Et, iPr, or H) or pyridinium ([C5H5N+(CH2)3P(O)(OR1)]Br-; R1 = iPr, or H) were synthesized in two or three steps (Arbuzov, Menshutkin and bis-dealkylation reactions) under MW conditions within minutes in good yields. These protocols were then compared to thermal heating (TH). Both H2O and MeCN were found to be effective solvents for the Menshutkin and the bis-dealkylation of phosphonate QAC. These reactions were carried out for the first time under MW heating sequentially or in a one-vessel procedure with mineral acids. New compounds were characterized by NMR spectroscopy, HRMS spectrometry and in two instances (17, 20) by X-ray crystallography. We provide X-ray crystallographic evidence for the isolation of the QAC phosphonic acids as the free acids containing the Br- counter ion instead of the previously suggested phosphobetaine internal salts. Self-assembled monolayers of the phosphonic acid QAC prepared in this study are expected to be suitable antimicrobial coatings for metal surfaces used for biomedical applications. Keywords: Arbuzov, didealkylation, environmentally friendly methods, Menshutkin, microwave, monolayers, phosphonate, phosphonic acid, quaternary ammonium antimicrobials, stainless steel coatings.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| 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 it