Results 71 to 80 of about 20,092 (323)

Synthesis of Cyclic Sulfilimines and Sulfoximines via Copper‐Mediated C(sp2)–H Sulfanylation of Benzylamines with a Catalytic Transient Directing Group

ChemistryEurope, EarlyView.
Copper‐mediated transient C─H sulfanylation of benzylamines with sulfenamides enables rapid access to thioethers, cyclic sulfilimines, and sulfoximines. Mechanistic investigations using 1H NMR and electron paramagnetic resonance spectroscopy reveal an unprecedented thermally induced homolytic cleavage of the sulfenamide N─S bond, slowly releasing the ...
Tsz‐Kan Ma, Peerawat Saejong, King‐Long Or, Callum S. Begg, James A. Bull   +4 more
wiley   +1 more source

General Method for the Preparation of Substituted 2-Amino-4H,5H-pyrano[4,3-b]pyran-5-ones and 2-Amino-4H-pyrano[3,2-c]pyridine-5-ones

Molecules, 2000
Reaction of 4-hydroxy-6-methyl-2-pyrone (1a) as well as 4-hydroxy-6-methyl-2(1H)-pyridones (1b-d) with arylmethylene malononitriles or arylmethylene methyl cyanoacetates (2a-h) leads to the formation of the very stable 5,6-fused bicyclic 2-amino-4Hpyran ...
Dieter Heber, Ivo C. Ivanov, Edmont V. Stoyanov   +2 more
doaj   +1 more source

Synthesis of azo pyridone dyes [PDF]

Hemijska industrija, 2011
Over 50% of all colorants which are used nowdays are azo dyes and pigments, and among them arylazo pyridone dyes (and pigments) have became of interest in last several decades due to the high molar extinction coefficient, and the medium to high light and wet fastness properties. They find application generally as disperse dyes.
Dusan Mijin, Gordana Uscumlic, Natasa Valentic, Aleksandar Marinkovic   +3 more
openaire   +3 more sources

Advances in Enaminomaleimides Chemistry: Synthesis, Chemical Applications, and Perspectives

ChemistryEurope, EarlyView.
Enaminomaleimides are versatile building blocks for the construction of functionalized heterocycles. Their unique nucleophilic character, contrasting with the classical electrophilic nature of maleimides, enables diverse synthetic applications, showing promising potential in both materials science and medicinal chemistry.
Adrián López‐Francés, Birane Diop, Xingyu Jiang, Jean Rodriguez, Muriel Amatore, Thierry Constantieux   +5 more
wiley   +1 more source

Palladium‐Catalyzed Non‐Directed C─H Functionalization of Arenes with Trifluoromethylated Olefins

Chemistry – A European Journal, EarlyView.
Palladium‐catalyzed non‐directed C─H alkenylation of simple arenes with α‐trifluoromethyl styrene derivatives is accomplished using 2‐pyridone ligands, which significantly enhances both yield and selectivity. This approach enables efficient functionalization across a wide range of arenes and styrene substrates.
Levin Stockmann, Claire Empel
wiley   +1 more source

Ordered and ushered; the assembly and translocation of the adhesive Type I and P Pili [PDF]

, 2013
Type I and P pili are chaperone-usher pili of uropathogenic Escherichia coli, which allow bacteria to adhere to host cell receptors. Pilus formation and secretion are orchestrated by two accessory proteins, a chaperone, which catalyses pilus subunit ...
Aberg, Bouckaert, Chorell, Clarke, Cusumano, Di Yu, Huang, Klinth, Larsson, Leney, Lindberg, Lo, Mapingire, Morrissey, Nuccio, Phan, Schilling, Ulett, Wallden, Zhang   +19 more
core   +2 more sources

α,β‐Alkylation Reactions Catalyzed by Ruthenium Triphenylphosphine Complexes Bearing Substituted Pyridine–Quinoline Based Ligands

European Journal of Inorganic Chemistry, EarlyView.
A series of new air‐stable ruthenium(II) bis‐triphenylphosphine complexes comprising substituted pyridine–quinoline ligands have been developed via a one‐pot procedure. The new complexes successfully serve as scaffolds to promote catalytic CC bond formation, more precisely the α‐alkylation of ketones with primary alcohols, via the borrowing hydrogen ...
Nikolaos Zacharopoulos, Panagiotis‐Georgios Kanellopoulos, Evangelos Bakeas, Antigoni Cheilari, Gregor Schnakenburg, Athanassios Chrissanthopoulos, Athanassios Philippopoulos   +6 more
wiley   +1 more source

Synthesis of New Aza-Heterocyclic Based on 2-Pyridone

Chemistry Proceedings
In this work, we present new methods of synthesis of different molecules including a 2-pyridone nucleus. First, we prepared a series of 1H-free 2-pyridones and N-alkyl 2-pyridones from ethyl cyanoacetate, aromatic aldehydes, various acetophenone ...
Ikram Baba-Ahmed, Zahira Kibou, Julio A. Seijas, Noureddine Choukchou-Braham, M. Pilar Vázquez-Tato   +4 more
doaj   +1 more source

Synthesis and chemical properties of 3-acyl- and 3-carbethoxy-4-pyrones [PDF]

, 2013
Реакция 1-арил-2-диметиламинометиленбутан-1,3-дионов с диэтиоксалатом в присутствии гидрида натрия в ТГФ приводит к образованию этил 5-ароил-4-оксо-4Н-пиран-2- карбоксилатам, из которых 4-оксо-6-арил-4Н-пиран-2-карбоновые кислота (6- арилкомановая ...
Obydennov, D. L., Обыденнов, Д. Л.   +1 more
core  

Synthesis, Characterization, and Electrochemical Properties of Tri‐ and Tetranuclear CoIII‐Oxo Complexes

European Journal of Inorganic Chemistry, EarlyView.
A series of three tetranuclear and two trinuclear Co(III) carboxylate complexes are synthesized and thoroughly spectroscopically and electrochemically characterized. The relative stability of the tetranuclear versus trinuclear complexes is investigated by density functional theory calculations, and the infrared and ultraviolet/visible spectra are ...
Timo Fockenberg, Niklas Sülzner, Hatem M. A. Amin, Christoph Wölper, Christof Hättig, Stephan Schulz   +5 more
wiley   +1 more source