Results 11 to 20 of about 10,848 (250)

Ceria–Zirconia-Supported Pt as an Efficient Catalyst for the Sustainable Synthesis of Hydroxylamines and Primary Amines via the Hydrogenation of Oximes Under Ambient Conditions [PDF]

Molecules
Amines and hydroxylamines are essential compounds in the synthesis of pharmaceuticals and other functionalized molecules. However, the synthesis of primary amines and particularly hydroxylamines remains a challenging task.
Elena Redina, Inna Ivanova, Olga Tkachenko, Gennady Kapustin, Igor Mishin, Leonid Kustov   +5 more
doaj   +2 more sources

Competition of the Addition/Cycloaddition Schemes in the Reaction Between Fluorinated Nitrones and Arylacetylenes: Comprehensive Experimental and DFT Study [PDF]

Molecules
The course of the reactions of acetylenes with fluorinated nitrones in the presence of Zn(OTf)2 and Et2Zn was investigated. The formation of hydroxylamines and/or 1,2-oxazolines as products was observed.
Szymon Jarzyński, Andrzej Krempiński, Anna Pietrzak, Radomir Jasiński, Emilia Obijalska   +4 more
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Crown-hydroxylamines are pH-dependent chelating N,O-ligands with a potential for aerobic oxidation catalysis [PDF]

Nature Communications, 2023
Despite the rich coordination chemistry, hydroxylamines are rarely used as ligands for transition metal coordination compounds. This is partially because of the instability of these complexes that undergo decomposition, disproportionation and oxidation ...
Vladislav K. Lesnikov, Ivan S. Golovanov, Yulia V. Nelyubina, Svetlana A. Aksenova, Alexey Yu. Sukhorukov   +4 more
doaj   +2 more sources

Expedient Organocatalytic Syntheses of 4-Substituted Pyrazolidines and Isoxazolidines [PDF]

Molecules, 2016
The efficient organocatalytic synthesis of heterocyclic systems of biological relevance is a subject of growing interest. We have found that the pyrrolidine/benzoic acid-catalyzed reaction of α-substituted propenals such as methacrolein, 2-benzylpropenal
Tarek Yousfi, Alysha Elliott, Messiad Hanane, Rachid Merdes, Albert Moyano   +4 more
doaj   +2 more sources

Trifluoroethanol-assisted asymmetric propargylic hydrazination to α-tertiary ethynylhydrazines enabled by sterically confined pyridinebisoxazolines [PDF]

Nature Communications
We report the highly enantioselective Cu-catalyzed asymmetric propargylic substitution (APS) of α-tertiary propargylic electrophiles using hydrazines and hydroxylamines as a fruitful strategy to access multifunctional α-tertiary hydrazines or ...
Yi Gong, Zheng Zhang, Huijuan Liu, Tao Wang, Mengmeng Jiang, Nan Feng, Peiying Peng, Huimin Wang, Feng Zhou, Xin Wang, Jian Zhou   +10 more
doaj   +2 more sources

Application of a fully 3D printed carbon electrode for the double potential step Chronoamperometric determination of 2,4-dinitrophenol in environmental water samples [PDF]

Frontiers in Chemistry
IntroductionThe detection of nitrophenolic compounds in environmental water sources is critical due to their toxicity and persistence. This study presents the first reported application of a fully 3D printed carbon nanofiber-graphite-polystyrene working ...
Daniel Steven Shaw, Daniel Steven Shaw, Zuhayr Rymansaib, Pejman Iravani, Kevin C. Honeychurch   +4 more
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Noninvasive in vivo discrimination between mitochondrial ROS and global ROS production in solid tumors using EPR spectroscopy [PDF]

Redox Biology
Because the precise site of ROS production plays a key role in cellular redox signaling and its (patho)physiological consequences, it is crucial to develop tools that enable site-specific detection of ROS in complex systems, including in vivo.
Barbara Mathieu, Justin D. Rondeau, Lionel Mignion, Pierre Sonveaux, Bernard Gallez   +4 more
doaj   +2 more sources

Examining the effects of additives and precursors on the reactivity of rhodium alkyl nitrenes generated from substituted hydroxylamines [PDF]

Frontiers in Chemistry, 2023
In this study, the reactivity of the alkyl nitrenes, generated from the substituted hydroxylamine precursors, was determined using the same rhodium catalyst. The results revealed that in competitive C–H insertion experiments, the regioselectivity between
Hidetoshi Noda, Yasuko Asada, Masakatsu Shibasaki   +2 more
doaj   +2 more sources

Polar-to-Radical Crossover in Catalyst-Free Olefin Halo-Hydroxylamination: A Direct Route to Multifunctional Electrophilic Hydroxylamines [PDF]

JACS Au
Young-Do Kwon, Daniel Joaquin, Michael T. Davenport, Jeff Olsen, Melany Carpio, Muhammed Yousufuddin, Daniel H. Ess, László Kürti   +7 more
doaj   +2 more sources

Safety assessment of the substance amines, di‐C14‐C20‐alkyl, oxidised, from hydrogenated vegetable oil, for use in food contact materials [PDF]

EFSA Journal
The EFSA Panel on Food Contact Materials, Enzymes and Processing Aids (CEP) assessed the safety of amines, di‐C14‐C18‐alkyl, oxidised, renamed by the Panel as amines, di‐C14‐C20‐alkyl, oxidised, from hydrogenated vegetable oil.
EFSA Panel on Food Contact Materials, Enzymes and Processing Aids (CEP), Claude Lambré, José Manuel Barat Baviera, Claudia Bolognesi, Andrew Chesson, Pier Sandro Cocconcelli, Riccardo Crebelli, David Michael Gott, Konrad Grob, Evgenia Lampi, Marcel Mengelers, Alicja Mortensen, Inger‐Lise Steffensen, Christina Tlustos, Henk Van Loveren, Laurence Vernis, Holger Zorn, Ronan Cariou, Laurence Castle, Emma Di Consiglio, Roland Franz, Maria Rosaria Milana, Eric Barthélémy, Remigio Marano, Gilles Rivière   +24 more
doaj   +2 more sources