2465-65-8Relevant articles and documents
Ultra-fast catalytic detoxification of organophosphates by nano-zeolitic imidazolate frameworks
Ebrahimi, Arash,Mohammadsalehi, Maedeh,Nassireslami, Ehsan,Zibaseresht, Ramin
, (2020)
Detrimental and injurious impacts of Organophosphates that have had on environment, humans, organisms and the other animals or plants have not been surreptitious to anyone worldwide. Nevertheless, up to now, among many efforts that have been devoted to detoxification of Organophosphates (OPs), catalytic detoxification has been the most applicable, cost-effective, efficacious and safest way to break down these dangerous materials. Herein, the utilization of zeolitic imidazolate frameworks (ZIFs), for the first time, has been reported to deactivate Diazinon as an organophosphate agent demonstrated at room temperature. In the following research, the catalysts were analyzed by PXRD, FT-IR, FE-SEM, BET, CO2 adsorption/desorption and TG. The decontamination processes were followed by 31P NMR, HPLC, and UV–vis to evaluate catalytic efficiency. Interestingly, supreme reusability, durability and potentially stunning catalytic activity represent them as alternate materials for their amazing elimination of OPs compared to the other MOFs.
Silica-Bound Sulfonic Acid Catalysts
Badley, Rickey D.,Ford, Warren T.
, p. 5437 - 5443 (1989)
The catalytic activity of colloidal silica sulfonic acid for the hydrolyses of diazinon and triphenylmethyl fluoride was compared with that of silica gel sulfonic acids, gel and macroporous poly(styrenesulfonic acids), powdered and soluble Nafion, p-toluenesulfonic acid, and hydrochloric acid.For diazinon hydrolysis, the colloidal catalyst was only slighty less active than the soluble strong acid catalysts and 2.8 times more active than any of other heterogeneous catalysts.The silica gel and polymeric sulfonic acid catalysts had similar activities.For triphenylmethyl fluoride hydrolysis all of the catalysts were only weakly active.
Bifunctional Thiourea-Catalyzed Stereoablative Retro-Sulfa-Michael Reaction: Concise and Diastereoselective Access to Chiral 2,4-Diarylthietanes
Bacsó, András,Szigeti, Mariann,Varga, Szilárd,Soós, Tibor
, p. 429 - 439 (2016/12/24)
Owing to the chiral recognition capacity of bifunctional thioureas, a stereoablative retro-sulfa-Michael reaction has been developed. Utilization of a biphasic system enabled us to render the process catalytic. The usefulness of this methodology was further illustrated by the diastereoselective synthesis of all possible stereoisomers of 2,4-diarylthiethanes.
Rapidly formed quinalphos complexes with transition metal ions characterized by electrospray ionization mass spectrometry
Keller, Bernd O.,Esbata, Abdelhamid A.,Buncel, Erwin,Van Loon, Gary W.
, p. 1319 - 1328 (2013/07/28)
RATIONALE Electrospray ionization tandem mass spectrometry (ESI-MS/MS) offers the unique opportunity to characterize complexes of the organophosphorus pesticide (OP) quinalphos (PA-Q) with transition metal ions immediately formed after contact. This study complements research looking at longer term kinetics of quinalphos hydrolysis in the presence of transition metal ions and gives insights into the structural features of the initial complex formation in solution. (Hydrolysis reaction: PA-Q + H2O → PA-OH + HQ, where PA-OH is the diethyl phosphate product and HQ is hydroxyquinoxaline.) METHODS Low micromolar PA-Q solutions with an approximately 3-fold molar excess of transition metal ions were immediately analyzed after mixing. Fragmentation of the transition metal ion complexes with PA-Q was accomplished in two different ways: first, in-source fragmentation by elevating the declustering potential and second, low-energy collision-induced dissociation (CID). RESULTS For Ag +, the [PA-Q - Ag+] and respective Ag+- containing degradation product ions are readily observed. For Cu2+, we observed the [PA-Q + Cu2+ + NO3-] complex ion with weak intensity and strong signals from both the [2PA-Q + Cu +] and the [PA-Q + Cu+] ions, the latter two attributable to charge-state reduction in the gas phase from Cu(II) to Cu(I), indicating that PA-Q fulfills specific structural requirements of the formed complex for charge-state reduction during transition from solution to the gas phase. For Hg2+, the [PA-Q + Hg2+ + (PA-OH - H)-] ion was the largest observed species containing one Hg2+ ion. No 1:1 species ([PA-Q] or other degradation products:Hg2+) was observable. CONCLUSIONS ESI-MS/MS of complexes formed from PA-Q and transition metal ions is a formidable technique to probe initial formation of these complexes in solution. Previous work from other groups established structural requirements that enable charge-state reduction from Cu(II) to Cu(I) in ligand complexes during transition into the gas phase, and these rules allow us to propose structural features of PA-Q complexes with copper ions in solution. Copyright 2013 John Wiley & Sons, Ltd. Copyright
