Results 51 to 60 of about 20,827 (302)
Frame‐Shifted Synthesis of Oligoheterocycles as a Platform for Molecular Design
Angewandte Chemie, Volume 138, Issue 2, 9 January 2026.Modern chemistry seeks to turn the simple raw materials into complex molecules that matter in health, agriculture, and technology. Among these, oligoheterocycles stand out for their versatility, yet they are most often built by cross‐coupling reactions that often rely on expensive metal catalysts.
Kane A. C. Bastick +6 more
wiley +2 more sources
Two Polymorphs of Bis(4-methoxyphenyl)tellurium(IV) Diiodide [PDF]
, 1998 The title compound, (C7H7O)2Tel2 (orC14H14I2O2Te), crystallizes in space group P1, either with Z = 8, (Ia), or Z = 4, (Ib). The six independent molecules [four in (Ia) and tow in (Ib)] have very similar structures.
Alvarez-Larena, Angel +5 more
core +2 more sources
Solution Equilibrium Studies on Anticancer Ruthenium(II)–eta6-p-cymene Complexes of 3-Hydroxy-2(1H)-pyridones [PDF]
, 2013 Ru-II(eta(6)-p-cymene) complexes of bidentate (0,0) alkoxycarbonylmethyl-3-hydroxy-2(1H)-pyridone ligands exhibit in vitro antitumor activity. We determined the stoichiometry and stability in aqueous solution of two examples by pH-potentiometry, H-1 NMR ...
Bognár, Gabriella M. +4 more
core +1 more source
Addition of dianions of carboxylic acids to imines. Influence of the acid in the outcome of the reaction [PDF]
, 2009 The addition of different carboxylic acids dianions to N-benzylidenebenzeneamine have been studied. The outcome of the reaction depends on the acid. Saturated ones lead to β-aminoacids with good yields and syn-selectivity whereas α,β-unsaturated ones ...
Gil Grau, Salvador +2 more
core +1 more source
Pyridonderivate aus 3-Amino-2H-azirinen und Cyclopropenonen
CHIMIA, 1978 Reaction of the 3-dimethylamino-2H-azirines 1a and 1b with diphenylcyclopropenone (2a) in ether or acetonitrile leads to the 2-dimethylamino-5,6-diphenyl-4(3H)-pyridones 3a and 3b in 70 and 80% yield, respectively. The structure of these 1:1-adducts has
Stanislav Chaloupka, Heinz Heimgartner
doaj +1 more source
Recent Progress in Nitro-Promoted Direct Functionalization of Pyridones and Quinolones
Molecules, 2020 Nitro group is one of the most important functional groups in organic syntheses because its strongly electron-withdrawing ability activates the scaffold, facilitating the reaction with nucleophilic reagents or the Diels−Alder reaction.
Feiyue Hao, Nagatoshi Nishiwaki
doaj +1 more source
Pd(II)‐Catalyzed Strategies for the β‐Arylation of α‐Amino Acids: An Overview
Chemistry – A European Journal, EarlyView.The graphical abstract summarizes the review “Pd(II)‐Catalyzed Strategies for the β‐Arylation of α‐Amino Acids: An Overview”, highlighting representative Pd(II)‐catalyzed methods for the β‐arylation of α‐amino acids. Key mechanistic features, substrate diversity, and synthetic relevance of these transformations are showcased. Abstract Metal‐catalyzed C─
Davide Illuminati +4 more
wiley +1 more source
Organometallic catalysis for applications in radical chemistry and asymmetric synthesis [PDF]
, 2014 Two organometallic catalysis studies are presented. The first one deals with the development of a new catalytic agent based on the mixture of a hydride and an iron salt to trigger efficient radical cyclization processes.
Ateywiohrera +17 more
core +3 more sources
Transacylierungen mit Acylderivaten des 4‐Pyridons [PDF]
Chemische Berichte, 1980 AbstractMit N‐Acyl‐4‐pyridonen (2a, b) sowie mit 4‐(Benzoyloxy)pyridin (3a) werden in Methylenchlorid oder Chloroform aliphatische und aromatische Amine sowie Thiole glatt zu den Amiden (4 – 6) und Thioestern (7, 8) acyliert. Primäre und sekundäre Alkohole reagieren langsamer, tert‐Butylalkohol nur noch mit 3a unter Basenkatalyse sowie mit den ...
Effenberger, Franz, Bessey, Eberhard
openaire +1 more source
Photochemistry of Aromatic N‐Oxides in Water Probed by Time‐Resolved X‐ray Absorption Spectroscopy
Chemistry – A European Journal, EarlyView.Time‐resolved XAS at the nitrogen and oxygen K‐edges is applied to the photorearrangement of two N‐oxides in water. Pyridine N‐oxide rapidly forms the oxaziridine isomer. Pyridazine N‐oxide undergoes ring opening to the diazo compound, without any evidence of intermediates.
Maximilian Paradiz Domínguez +3 more
wiley +1 more source