Results 21 to 30 of about 5,350,209 (268)

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

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

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

Enantioselective [3 + 2] Cycloaddition Reaction of Ethynylethylene Carbonates with Malononitrile Enabled by Organo/Metal Cooperative Catalysis.

Organic Letters, 2018
The first catalytic asymmetric decarboxylative [3 + 2] cycloaddition reaction of ethynylethylene carbonates with malononitrile has been developed successfully by an organo/copper cooperative system.
Yu-Chen Zhang, Bo-Wen Zhang, Rui‐Long Geng, Jin Song   +3 more
semanticscholar   +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

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

Quaternary Carbon Center Forming Formal [3 + 3] Cycloaddition Reaction via Bifunctional Catalysis: Asymmetric Synthesis of Spirocyclohexene Pyrazolones.

Organic Letters, 2017
A variety of spirocyclohexene pyrazolones were synthesized in good yields with excellent stereoselectivities through an asymmetric, intermolecular, quaternary carbon center forming [3 + 3] cycloaddition reaction catalyzed by a bifunctional catalyst.
Jin-Yu Liu, J. Zhao, Jia-Lu Zhang, Peng‐Fei Xu   +3 more
semanticscholar   +1 more source

Promotion mechanism of hydroxyl groups in catalyzing CO2 cycloaddition

Journal of CO2 Utilization
In this study, a series of hydroxy-functionalized quaternary ammonium salt catalysts, i.e., NEt3(HE)Br, NEt2(HE)2Br, NEt1(HE)3Br, and N(HE)4Br, were successfully prepared by quantitatively grafting hydrogen-bond donors (HBDs) as electrophilic sites on ...
Yiming Wang, Wensheng Wei, Yuxin Wang, Guangwen Xu, Jinggang Zhao, Lei Shi   +5 more
doaj   +1 more source

Unveiling the Chemistry of Higher-Order Cycloaddition Reactions within the Molecular Electron Density Theory

Chemistry, 2022
The higher-order cycloaddition (HOCA) reaction of tropone with cyclopentadiene (Cp) has been studied within the Molecular Electron Density Theory.
Luis R. Domingo, Mar Ríos-Gutiérrez, Patricia Pérez   +2 more
doaj   +1 more source