Results 21 to 30 of about 2,202,700 (266)

The Cycloaddition of the Benzimidazolium Ylides with Alkynes: New Mechanistic Insights. [PDF]

PLoS ONE, 2016
New insights concerning the reaction mechanism in the cycloaddition reaction of benzimidazolium ylides to activated alkynes are presented. The proposed pathway leading both to 2-(1H-pyrrol-1-yl)anilines and to pyrrolo[1,2-a]quinoxalin-4(5H)-ones involves
Costel Moldoveanu, Gheorghita Zbancioc, Dorina Mantu, Dan Maftei, Ionel Mangalagiu   +4 more
doaj   +1 more source

Efficient fabrication of oxazolidinones for the carboxylative cyclization with carbon dioxide

Journal of CO2 Utilization, 2023
Overuse of fossil energy has accelerated the development of industrialization and improved the quality of human life. However, it also leads to the excessive emission of CO2, and the greenhouse effect is threatening global climate stability and human ...
Xin Yang, Lekai Xu, Yaqiong Zhu, Shaojun Zhang, Guanwei Jia, Jiang Du   +5 more
doaj   +1 more source

Unusual Structure-Energy Correlations in Intramolecular Diels–Alder Reaction Transition States [PDF]

, 2014
Detailed analysis of calculated data from an experimental/computational study of intramolecular furan Diels–Alder reactions has led to the unusual discovery that the mean contraction of the newly forming C-C σ-bonds from the transition state to the ...
Robert L. Rae, Paterson, Martin; id_orcid, Justyna Żurek, Justyna M. Żurek, Rae, Robert, Robert Rae, Paterson, Martin J., Martin J. Paterson, Martin Paterson, Magnus Bebbington, Bebbington, Magnus, Żurek, Justyna M., Magnus W. P. Bebbington, Rae, Robert L., Żurek, Justyna; id_orcid   +14 more
core   +1 more source

Highly Efficient Construction of Sugar-Fused Spirochromanono Pyrrolidines/Pyrrolizidines/Thiolizidines via 1,3-Dipolar Cycloaddition of Azomethine Ylides

SynOpen, 2017
A variety of sugar-fused chromanono pyrrolidines/pyrrolizidines/thiolizidines have been synthesized by intermolecular 1,3-dipolar cycloaddition reaction of azomethine ylides (generated from glucose aldehyde and different secondary amino acids) with ...
Sirisha Nallamala, Srikumar Mannem, Raghunathan Raghavachary   +2 more
doaj   +1 more source

Cycloaddition Reaction

, 2020
1,3-Dipolar cycloaddition reaction between organic azide and metal carbyne is a useful strategy to construct metallacycles. However, the electronic behavior of organic azide in 1,3-dipolar cycloaddition reactions is less explored.
Zhenyang Lin, Lu, Zhengyu, Fu Kit Sheong, Zhang, Hong, Zhengyu Lu, Sheong, Fu Kit, Zhang, Jing Xuan, Hong Zhang, Lin, Zhenyang, Jing‐Xuan Zhang   +9 more
core   +1 more source

Ab initio study of the mechanism of formation of a spiro-Sn-heterocyclic ring compound by the cycloaddition reaction of H2C=Sn: and ethylene [PDF]

Journal of the Serbian Chemical Society, 2019
X2C=Sn: (X = H, Me, F, Cl, Br, Ph, Ar…) are new species of chemistry. The cycloaddition reactions of X2C=Sn: is a new study field of stannylene chemistry.
Tan Xiaojun, Lu Xiuhui
doaj   +1 more source

Incorporation of Spin Labels and Paramagnetic Tags for Magnetic Resonance Studies Using Cycloaddition Reactions as a Tool

Reactions
The cycloaddition reaction is one of the most common reactions in organic chemistry. It has been applied in various fields. Herein, we focus on the application of cycloaddition reactions in investigating biological molecules and materials using magnetic ...
Amarendra Nath Maity, Amiya Kumar Medda, Shyue-Chu Ke   +2 more
doaj   +1 more source

Diels–Alder reactions in confined spaces: the influence of catalyst structure and the nature of active sites for the retro-Diels–Alder reaction

Beilstein Journal of Organic Chemistry, 2016
Diels–Alder cycloaddition between cyclopentadiene and p-benzoquinone has been studied in the confined space of a pure silica zeolite Beta and the impact on reaction rate due to the concentration effect within the pore and diffusion limitations are ...
Ángel Cantín, M. Victoria Gomez, Antonio de la Hoz   +2 more
doaj   +1 more source

Reactivity of (Z)-4-arylidene-5(4H)-oxazolones: [4+2] cycloaddition versus [4+3] cycloaddition/nucleophilic trapping [PDF]

, 2002
The use of different aluminum derivatives in the reaction between cyclopentadiene and (Z)-2-phenyl-4-arylidene-5(4H)-oxazolones, and in particular the use of different equivalents of the reagent, allows the modulation of the synthesis of the norbornane ...
Peregrina, J.M. [0000-0003-3778-7065], Avenoza, A. [0000-0002-5465-3555], Busto, J.H. [0000-0003-4403-4790], Cativiela, C., Peregrina, J.M., Busto, J.H., Avenoza, A.   +6 more
core   +1 more source

Enantioselective cycloaddition reactions

ChemInform, 1991
Publisher Summary This chapter reviews the cycloadditions reactions because they are popular, widely used, and also constitutes enormous body of chemistry. The chapter focuses on the landmark achievements as well as state-of-the-art examples of relevant chemistry.
openaire   +2 more sources