Results 11 to 20 of about 41,109 (281)
On the strong difference in reactivity of acyclic and cyclic diazodiketones with thioketones: experimental results and quantum-chemical interpretation [PDF]
Beilstein Journal of Organic Chemistry, 2015 The 1,3-dipolar cycloaddition of acyclic 2-diazo-1,3-dicarbonyl compounds (DDC) and thioketones preferably occurs with Z,E-conformers and leads to the formation of transient thiocarbonyl ylides in two stages.
Andrey S. Mereshchenko +5 more
doaj +5 more sources
Deterministic Covalent Organic Functionalization of Monolayer Graphene with 1,3-Dipolar Cycloaddition Via High Resolution Surface Engineering [PDF]
J. Mater. Chem. C 11 (2023) 2630 - 2639, 2022 Spatially-resolved organic functionalization of monolayer graphene is successfully achieved by combining low-energy electron beam irradiation with 1,3-dipolar cycloaddition of azomethine ylide. Indeed, the modification of the graphene honeycomb lattice obtained via electron beam irradiation yields to a local increase of the graphene chemical reactivity.
Basta, Luca +7 more
arxiv +3 more sources
Recent advances in the catalytic asymmetric 1,3-dipolar cycloaddition of azomethine ylides. [PDF]
Chemical Communications, 2014 Catalytic asymmetric 1,3-dipolar cycloadditions of azomethine ylides have turned out to be one of the most efficient methods for the preparation of enantioenriched pyrrolidines.
J. Adrio, J. Carretero
semanticscholar +3 more sources
Synthesis of 1,4-naphthoquinone derivatives using 1,3-dipolar cycloaddition and Sonogashira reactions [PDF]
Orbital: The Electronic Journal of Chemistry, 2010 Naphthoquinones are known according to their important bio-activities, such as their antitumoral and topoisomerase inhibition properties. From 2-azido (3) or 2,3-diacetylene-1,4-naphthoquinone (4) it was possible to obtain triazole derivatives ...
Wilson Silva do Nascimento +3 more
doaj +2 more sources
Understanding the 1,3‐Dipolar Cycloadditions of Allenes [PDF]
Chemistry – A European Journal, 2020 AbstractWe have quantum chemically studied the reactivity, site‐, and regioselectivity of the 1,3‐dipolar cycloaddition between methyl azide and various allenes, including the archetypal allene propadiene, heteroallenes, and cyclic allenes, by using density functional theory (DFT).
Kevin van Dommelen +5 more
openaire +5 more sources
SynOpen, 2022 The versatility and effectiveness of MnVI-NPs as a catalyst is examined for the generation of nitrile oxides from aldoximes and subsequent 1,3-dipolar cycloaddition reactions.
Yasmin Saima, Saikat Khamarui
doaj +1 more source
Molecules, 2022 The 1,3-dipolar cycloaddition of 1,2-dithiole-3-thiones with alkynes to form 1,3-dithioles is one of the most studied reactions in this class of polysulfur-containing heterocycles. Nucleophilic substitution of chlorine atoms in dimethyl 2-(1,2-dichloro-2-
Vladimir A. Ogurtsov, Oleg A. Rakitin
doaj +1 more source
1,3-Dipolar cycloadditions of acridine with nitrile oxides [PDF]
Arkivoc, 2002 Siteand regio-isomeric mono-cycloadducts 9 are formed in the reactions of mesito1b and dichloromesitonitrile oxide 1c with acridine 6 in a 1:2 ratio, while the reaction of 1b and 6 in a 10:1 ratio afforded, besides the mono-cycloadduct 9b and traces of the corresponding oxime 10b, the bis-cycloadduct 12 with the opposite regiochemistry to that of the ...
CORSARO, Antonino +5 more
openaire +9 more sources
An Overlooked Pathway in 1,3‐Dipolar Cycloadditions of Diazoalkanes with Enamines [PDF]
Angewandte Chemie International Edition, 2022 AbstractMethyl diazoacetate reacts with 1‐(N‐pyrrolidino)cycloalkenes to give products of 1,3‐dipolar cycloadditions and azo couplings. The kinetics and mechanisms of these reactions were investigated by NMR spectroscopy and DFT calculations. Orthogonal π‐systems in the 1,3‐dipoles of the propargyl‐allenyl type allow for two separate reaction pathways ...
Le Li +5 more
openaire +3 more sources
Recent Developments on 1,3-Dipolar Cycloaddition Reactions by Catalysis in Green Solvents
Catalysts, 2020 The use of eco-compatible synthetic procedures in organic reactions and, in particular, in 1,3-dipolar cycloaddition reactions, has recently received a great deal of attention and considerable progress has been achieved in this area in the last years ...
L. Maiuolo +3 more
semanticscholar +1 more source