Results 51 to 60 of about 41,109 (281)

1,3-Dipolar Cycloadditions to Bicyclic Olefins. I. 1,3-Dipolar Cycloadditions to Norbornadienes [PDF]

Bulletin of the Chemical Society of Japan, 1977
Abstract The 1,3-dipolar cycloadditions of phenylglyoxylonitrile oxide, benzonitrile-N-phenylimine, or N-phenyl-C-p-nitrophenylnitrone to norbornadiene, 2,3-dicyanonorbornadiene, and 2,3-bis(methoxycarbonyl)norbornadiene give the endo-adducts, together with the exo-adducts.
Eiji Imoto, Hisaji Taniguchi, Toshikazu Ikeda, Yoshihiro Yoshida   +3 more
openaire   +3 more sources

Synthesis of bis-spirocyclic derivatives of 3-azabicyclo[3.1.0]hexane via cyclopropene cycloadditions to the stable azomethine ylide derived from Ruhemann's purple

Beilstein Journal of Organic Chemistry, 2022
A reliable method for the synthesis of bis-spirocyclic derivatives of 3-azabicyclo[3.1.0]hexanes through the 1,3-dipolar cycloaddition (1,3-DC) reactions of cyclopropenes to the stable azomethine ylide – protonated form of Ruhemann's purple (PRP) has ...
Alexander S. Filatov, Olesya V. Khoroshilova, Anna G. Larina, Vitali M. Boitsov, Alexander V. Stepakov   +4 more
doaj   +1 more source

Supramolecular Assemblies Constructed by Cucurbituril-Catalyzed Click Reaction [PDF]

, 2011
Cataloged from PDF version of article.Cucurbituril homologues are multi-functional macrocycles that can find applications in many areas and have numerous interesting features setting them apart from the other macrocycles.
Angelos, Ariga, Behrend, Bonnet, Buschmann, Buschmann, Buschmann, Carlqvista, Celtek, Choi, Choi, Coti, Day, Frampton, Freeman, Germain, Hanni, Harada, Huang, Huisgen, Huisgen, Isaacs, Jeon, Jeon, Jeon, Jiao, Jimenez, Jimenez-Molero, Jun, Kay, Ke, Kim, Kim, Ko, Kolb, Krasia, Krasia, Lagona, Lee, Lee, Lehn, Liu, Liu, Marquez, Meschke, Mock, Mock, Mock, Mock, Mock, Mock, Mock, Ong, Oshovsky, Rauwald, Rekharsky, Rostovtsev, Sauvage, Tan, Tornoe, Tuncel, Tuncel, Tuncel, Tuncel, Tuncel, Tuncel, Tuncel, Tuncel, Watanabe, Whang, Whiting   +70 more
core   +2 more sources

Quantum-chemistry-aided identification, synthesis and experimental validation of model systems for conformationally controlled reaction studies: Separation of the conformers of 2,3-dibromobuta-1,3-diene in the gas phase [PDF]

, 2020
The Diels-Alder cycloaddition, in which a diene reacts with a dienophile to form a cyclic compound, counts among the most important tools in organic synthesis. Achieving a precise understanding of its mechanistic details on the quantum level requires new experimental and theoretical methods.
arxiv   +1 more source

Spatial Separation of the Conformers of Methyl Vinyl Ketone [PDF]

J. Phys. Chem. A 2020, 2020
Methyl vinyl ketone (C$_4$H$_6$O) is a volatile, labile organic compound of importance in atmospheric chemistry. We prepared a molecular beam of methyl vinyl ketone with a rotational temperature of 1.2(2)~K and demonstrated the spatial separation of the \emph{s-cis} and \emph{s-trans} conformers of methyl vinyl ketone using the electrostatic deflector.
arxiv   +1 more source

One-step synthesis of differently bis-functionalized isoxazoles by cycloaddition of carbamoylnitrile oxide with β-keto esters [PDF]

, 2012
A new protocol for synthesizing different functionalized isoxazoles is provided. Carbamoylnitrile oxide generated from nitroisoxazolone underwent inverse electron-demand 1,3-dipolar cycloaddition with 1,3-dicarbonyl compounds in the presence of magnesium
975, 976, 977, 978, 979, 980, 981, 982, Ariga, Masahiro, Hirao, Shotaro, Ise, Yumiko, Kobiro, Kazuya, Nishiwaki, Nagatoshi, Nishizawa, Maho, Saigo, Kazuhiko, Sawayama, Jun   +15 more
core   +1 more source

Synthesis of Heterocylic Compounds of Biological Interest from Carbohydrate Derivatives

Molecules, 2000
The synthesis of some isoxazolic compounds from carbohydrate derivatives is described. These products are obtained by 1,3-dipolar cycloaddition reaction and their functionalization leads to derivatives with potential biological activities.
M. F. Martinez Esperón, M. L. Fascio, N. B. D’Accorso   +2 more
doaj   +1 more source

Synthetic applications of 1,3-dipolar cycloaddition chemistry toward heterocycles and natural products

, 2002
Nitrones (Jason N. Martin and Raymond C. F. Jones). Nitronates (Scott E. Denmark and Jeromy J. Cottell). Azomethine Ylides (L. M. Harwood and R. J. Vickers). Carbonyl Ylides (Mark C. McMills and Dennis Wright).
A. Padwa, W. Pearson
semanticscholar   +1 more source

Copper(I)-Phosphinite Complexes in Click Cycloadditions: Three-Component Reactions and Preparation of 5-Iodotriazoles [PDF]

, 2016
© 2016 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.The remarkable activity displayed by copper(I)–phosphinite complexes of general formula [CuBr(L)] in two challenging cycloadditions is reported: a) the one-pot azidonation/cycloaddition of
Crosbie, P, Diez-Gonzalez, S, Lal, S, Perez, J   +3 more
core   +2 more sources

Enhanced Sampling for Free Energy Profiles with Post-Transition-State Bifurcations [PDF]

, 2022
We present a method to explore the free energy landscapes of chemical reactions with post-transition-state bifurcations using an enhanced sampling method based on well-tempered metadynamics. Obviating the need for computationally expensive DFT-level ab initio molecular dynamics simulations, we obtain accurate energetics by utilizing a free energy ...
arxiv   +1 more source