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Showing 1 to 20 of 27 for “"sulfonates"”.
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Asymmetrische Synthese von Beta-Aminosulfonaten, Beta-Sultamen und Gamma-Sultonen
… asymmetric synthesis of beta-amino-cyclohexyl sulfonates, beta-sultams and gamma-sultones has been developed. The key step of the synthesis is the Lewis acid (zinkbromide) catalyzed aza-Michael addition of the enantiopure hydrazines (S)-1-amino-2-methoxymethyl-pyrrolidine (SAMP) or …
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Asymmetric synthesis of sultones and sulfonic acid derivatives
… gamma-sultones via alpha-allylation of lithiated sulfonates bearing 1,2:5,6-di-O-isopropylidene-alpha-D-allofuranose as a chiral auxiliary has been developed. High asymmetric inductions of the alpha-allylations were achieved along with good to excellent yields. In all cases the diastereomerically …
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Évaluation in vitro de l'effet antitumoral de nouveaux composés sulfonates à l'aide de lignées de cellules cancéreuses du sein
… l’effet antitumoral de nouveaux composés sulfonates synthétiques sur la prolifération de lignées de cellules cancéreuses humaines du sein. Dans cette étude, les effets inhibiteurs de la croissance cellulaire de six nouveaux différents composés synthétiques sulfonates esters ont été évalués …
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Development and Mechanistic Investigation of the Palladium-Catalyzed Alpha-Arylation of Aldehydes and N-Arylation of Ammonia
… coupling of ammonia with aryl halides and sulfonates was also developed. The catalyst generated from Pd[P(o-tol)3]2 and the alkylbisphophine CyPF-t-Bu is a highly active and selective catalyst for the coupling of ammonia with aryl chlorides, bromides, iodides, and sulfonates. The couplings …
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Fundamental studies on 2,4,6-trichlorophenyl sulfonate esters
… an expansion to this 2,4,6 trichlorophenyl (TCP) sulfonates have been developed. These have the added advantage of lower toxicity and reduced cost of trichlorophenol. TCP sulfonates can be synthesised directly from sulfonic acids via activation by triphenylphosphine ditriflate in moderate to …
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Novel sulfur containing electrophiles in asymmetric organocatalysis
… the reactivity of alpha,beta-unsaturated sulfonates in many metal- and organocatalyzed reactions. We evaluated their reactivity and assembled a general procedure for the sulfa-Michael addition of aromatic thiols to (E)-sulfonates. However, this group of compounds turned out to be not very …
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Development and mechanistic investigation of the palladium-catalyzed α-arylation of aldehydes and N-arylation of ammonia
… coupling of ammonia with aryl halides and sulfonates was also developed. The catalyst generated from Pd[P(o-tol)3]2 and the alkylbisphophine CyPF-t-Bu is a highly active and selective catalyst for the coupling of ammonia with aryl chlorides, bromides, iodides, and sulfonates. The couplings …
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Advances in the Stille reaction and new methods for continuous flow Pd-catalyzed C-N bond forming reactions
… CsF in t-BuOH an array of aryl and heteroaryl sulfonates were successfully employed in these reactions. Morever, heteroarylstannanes, such as furyl, thienyl, and N-methylpyrrolyl, which are often prone to decomposition, were efficiently coupled under these conditions. Ortho-substitution on the …
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Cross-coupling reactions of unactivated alkyl halides
… alkyl electrophiles (e.g., halides and sulfonates). Although aryl and alkenyl electrophiles have been commonly used in such processes, the utility of alkyl substrates has been underdeveloped, and merits further exploration. We have developed the first palladium-based catalyst that is …
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Architecting an electro-chemical separation platform : from the business case to the first commercial product
… remove specific compounds such as carboxylates, sulfonates, phosphonates and potentially heavy metals. The aim of this thesis is to help the technology find a first market fit and build the foundation for a successful scale-up by defining its positioning within the treatment train of the …
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Navigating the Unregulated: A Multi-Tiered Public Health Risk Assessment of PFAS and N-DBPs Utilizing Unregulated Contaminant Monitoring Rule Data
… dominates, mimicking the behavior of persistent sulfonates; and (3) serum half-life is a more critical determinant of health risk than chain length alone, providing a vital framework to inform future regulations.
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Application of surfactant-polymer enhanced oil recovery in a high- salinity, high-temperature carbonate reservoir
… consists of carboxylates, internal olefin sulfonates and lauryl betaine surfactants. A mixture of dead oil and 20 wt.% toluene was used to represent the live oil at ambient pressure. The first three core floods recovered 75.5%, 72% and 71% respectively. However, when 1wt% NaPA was injected …
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New applications of heteroarylzinc nucleophiles
… in 2,4,6-trichlorophenyl (TCP) pyridine-2-sulfonates, and the parent pyridine-2-sulfonate was shown to react with amines. Less electron-rich aryl- and heteroarylzinc reagents reacted with TCPC to afford sulfonyl chlorides that were converted in situ to sulfonamides. Chapter 3. …
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High Temperature Polymers for Proton Exchange Membrane Fuel Cells
… substitution reactions with functional aryl sulfonates were used to prepare simple aryl or highly acidic fluorinated sulfonated copolymers. The proton conductivity and water sorption of the resulting copolymers increased with the ion exchange capacity, but changing the acidity of the sulfonic …
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Self-assembly of sulfonated amphiphiles for channel-like synthetic membranes
… symmetrical substituted alkali metal cationic sulfonates all exhibit columnar mesophases either on melting from the crystalline phase or on annealing at the proper temperature. The target molecule with polymerizable groups was also found to exhibit a hexagonal columnar mesophase between 115°C …
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Studies of Sulfur Reduction of Taurine and Taurine-Conjugated Bile Acids by Bile acid 7α-Dehydroxylating Bacteria
… sp. HD-17, in presence of 100 |j.M or 5 mM sulfonates were not significantly higher than those in the absence of sulfonate. In addition, the highest sulfide concentration determined from medium cultured with two different strains of bile acid 7α-dehydroxylating bacteria for a period of five …
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Development of Ion Pairing Strategies that Utilise Cations to Control Selectivity in Transition Metal-Catalysed Functionalisation of C–H Bonds
… of tetrabutylammonium salts of anionic aromatic sulfonates. Concurrent studies by Madalina Mihai revealed that borylation of the same substrates with neutral bipyridine ligands proceeded with an unexpected para-selectivity. Working closely with Madalina, Chapter 2.3 extends this methodology to …
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Molecular and biochemical characterization of hydroxyjasmonate and flavonoid sulfotransferases from Arabidopsis thaliana
… flavonol 7-ST from Flaveria bidentis that sulfonates only flavonol disulfates, AtST3a was found to accept a number of flavonols and flavone aglycones, as well as their monosulfate derivatives. The AtST3a is expressed only at the earlier stage of seedling development. In contrast, the …
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