Results 21 to 30 of about 42,977 (261)
HUISGEN AND HIS ADVENTURES IN A PLAYGROUND OF MECHANISMS AND NOVEL REACTIONS [PDF]
Química Nova, 2021 The death of professor Rolf Huisgen (1920-2020) was announced on March 26th 2020, in the midst of the COVID-19 pandemic. Professor Huisgen was professor emeritus at the University of Munich in Germany, and studied in detail the mechanism of the 1,3 ...
Daniel T. G. Gonzaga +5 more
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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
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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
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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
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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
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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
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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
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Dynamic Catalytic Highly Enantioselective 1,3‐Dipolar Cycloadditions [PDF]
Angewandte Chemie International Edition, 2021 AbstractIn dynamic covalent chemistry, reactions follow a thermodynamically controlled pathway through equilibria. Reversible covalent‐bond formation and breaking in a dynamic process enables the interconversion of products formed under kinetic control to thermodynamically more stable isomers.
Herbert Waldmann +9 more
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Triazole-oligomers by 1,3-dipolar cycloaddition [PDF]
ARKIVOC, 2006 A variety of triazole-oligomers have been prepared under microwave and conventional conditions from novel alkynes and azides.
Alan R. Katritzky +8 more
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Ultrasonics Sonochemistry, 2021 In the present study, following a one-pot two-step protocol, we have synthesized novel sulfonamides-isoxazolines hybrids (3a-r) via a highly regioselective 1,3-dipolar cycloaddition. The present methodology capitalized on trichloroisocyanuric acid (TCCA)
Aicha Talha +9 more
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