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Showing 1 to 17 of 17 for “"defluorination"”.
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Biological and bioelectrochemical defluorination of per- and polyfluoroalkyl substances (PFAS)
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-08-01
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Synthesis and biological evaluation of 11beta-substituted and 7alpha-substituted estradiol analogs for the study of estrogen responsive breast tumors
… level of bone activity, an index of metabolic defluorination, shows that the defluorination rates of these six estrogens are a complex function of structure and functionality. Least prone to defluorination is 11$\beta$-(2-fluoroethoxy)estradiol and most prone is …
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Radiation Transport in Low Pressure Plasmas: Lighting and Semiconductor Etching Plasmas
… to strongly bound films (like C2F6 plasmas), defluorination is no longer the dominant SiO2 etch process. Finally, we combined the models above to address radiation transport in fluorocarbon/Ar etching plasmas. We found that resonance radiation from Ar produced only small increases in etch rate …
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“Mycoremediation” of PFAS: application of wood decay fungi and natural wood substrates to investigate the tolerance, degradation, and sequestration capacity of fungi for perfluorocarboxylic acids:
… method to quantify PFAS removal, and to confirm defluorination; a prerequisite for meaningful biodegradation of PFAS. Next, through fungal screening via exposure to selected PFAS an appropriate model fungus was selected with the capacity to tolerate PFAS. Finally, PFAS degradation and …
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Thermal Decomposition Mechanisms of Per- and Polyfluoroalkyl Substances and Application to Analysis of Total Organofluorine
… catalysis effects. O2 can facilitate thermal defluorination by reacting with PFCAs directly and oxidizing pyrolysis products (e.g., fluorinated olefins and fluorocarbon radicals). The addition of platinum to the combustion process improved the defluorination efficiency of PFBA at lower …
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Isoflurane : interaction with hepatic microsomal enzymes
… The cytochrome P-450 isozymes catalysing the defluorination of isoflurane were assessed in hepatic microsomes from phenobarbital-, β-naphthoflavone- and pregnenolone-16α-carbonitrilepretreated and untreated rats. One or more of the cytochrome P-450 isozymes induced by phenobarbital and …
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Photolysis of fluorinated organic molecules: fluorine mass balances and the roles of nucleophiles, rings, and degree of fluorination
… degradation product across all studies. While defluorination into inert fluoride is the ideal degradation result, a range of organofluorine products were formed. Fluoroacetic acids, acetamides, and products retaining the parent compound fluorinated motifs were observed. The results of these …
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Functional Polymer Materials: From Iptycenes to Ring-Opening Polymerizations
… sulfoxide elimination, and reductive defluorination are discussed. In Chapter 5, we study a family of bottlebrush polymers that consist of a flexible backbone with rigid, porogenic side chains. Tuning of side-chain length and dispersity, as well as incorporation of new functional …
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Removal of Per- and Poly-fluoroalkyl Substances (PFAS) from Water: A Computational Approach
… reduced activation barriers, with successive defluorination emerging as the most kinetically favorable pathway. Complementary ML models developed for PFAS detection using o-phenylenediamine molecularly imprinted polymer electrochemical sensors demonstrate high classification accuracy, …
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Evaluation of the degradation of per- and polyfluoroalkyl substances (PFAS) using UV-activated silica-based granular media (UV/SGM)
… over each treatment experiment, with >90% defluorination achieved in environmental solutions. UV/SGM is demonstrated to be effect in reagent and complex matrices, energy efficient, easy to scale, and modular, allowing for end users needs to not only be met but exceeded, mitigating PFAS in …
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(De)fluorination of Organic Substrates Mediated by Nontrigonal Phosphorus Triamide
… or radical) fluorination, and 2) selective defluorination of polyfluorinated substrates. Both creating and breaking C−F bonds in selective manners are of great importance, and present challenges of their own. The work herein describes chemical transformations incorporating the cleavage or …
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Development of Methods for Boron Reagents
… alkenes in good yields (63-88%). A borylation, defluorination of alpha-trifluoromethyl-alpha,beta-unsaturated esters is described in Chapter 2. The borylation is copper-catalyzed (10 mol %) and proceeds in the presence of stoichiometric bis(pinacolato)diboron and sodium tert-butoxide. The …
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Tailoring Fluoride/Fluorine Bond Activity for High-Energy Li and Li-ion Batteries
… the R-Ph-SF₅ reactants allow for full reactant defluorination and a total of up to 8 e− transfer per molecule, yielding capacities of 861 mAh/g subscript reactant and voltages up to ~2.9 V vs. Li/Li⁺. At a cell level, gravimetric energies of 1085 Wh/kg were attained at 50 ºC, exceeding all …
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Chemistry of novel nanoscale carbon materials: Nanodiamond and carbon nano-onions
… was characterized by Raman, XRD, TEM et al. Defluorination treatment was also performed. All the samples show improved lubricating properties according to the test carried out by our collaborators.
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Removal of Perfluorooctane Sulfonate (PFOS) and Related Compounds From Industrial Effluents
… per mol of branched PFOS isomers was achieved. Defluorination of PFOS was also observed at environmental relevant conditions of 30°C and pH 7.0, albeit at lower degradation rates. Fluoride and carbon dioxide were identified as the major products of the chemical defluorination. Traces of …
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Molecular-Level Understanding of Electrochemical Reaction Mechanisms and Electrode Interphases in Metal-CFx Batteries
… structure. Furthermore, the electrochemical defluorination of CF<sub>x</sub> electrodes at room temperature was demonstrated using a liquid fluoride-ion conducting electrolyte paired with various metal anodes. Solid-state NMR spectroscopy and X-Ray diffraction measurements elucidated a novel …
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Regioselective, Nucleophilic Activation of C-F Bonds in o-Fluoroanilines
Reactions of fluorinated anilines with stoichiometric Ti(NMe2)4 in mesitylene (typically for 23 h at 120 °C) afforded moderate to high yields of the corresponding N,N-dimethyl-o-phenylenediamine derivatives resulting from defluoroamination of a fluorine atom ortho to the NH2 of the starting …