Results 71 to 80 of about 2,089,289 (186)

Cristais líquidos termotrópicos calamíticos contendo o heterociclo [1,2,3]-triazol 1,4-dissubstituído [PDF]

, 2006
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-Graduação em QuímicaA síntese e as propriedades térmicas de cinco séries homólogas de compostos calamíticos lineares e não lineares,
Santos, Deise Maria Pereira de Oliveira
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(4+3)-Cycloaddition of Donor-Acceptor Cyclopropanes with Thiochalcones: A Diastereoselective Access to Tetrahydrothiepines [PDF]

, 2019
A general approach is described for the formation of tetrahydrothiepines using donor-acceptor cyclopropanes. Thiochalcones, functioning as sulfur-containing four-atom building blocks, were reacted in a Lewis-acid-catalyzed formal (4+3)-cycloaddition ...
André U., Augustin, J. Luca, Merz, Grzegorz, Mloston, Peter G., Jones, Daniel, Werz   +4 more
core   +1 more source

3-Aminoisothiazol S-oxides : Reactivity in Diels Alder Cycloaddition Reaction

, 2005
3-Aminoisothiazol S-oxides: Reactivity in Diels Alder Cycloaddition ReactionWe studied the Diels Alder cycloaddition reaction of 3-aminoisothiazole S oxides substituted or not at 4 position.
C. Monzani, A. Sala, F. Clerici
core   +2 more sources

From Mechanistic Study to Chiral Catalyst Optimization: Theoretical Insight into Binaphthophosphepine-catalyzed Asymmetric Intramolecular [3 + 2] Cycloaddition

Scientific Reports, 2017
Density functional M11 was used to study the mechanism and enantioselectivity of a binaphthophosphepine-catalyzed intramolecular [3 + 2] cycloaddition reaction.
Meng Duan, Lei Zhu, Xiaotian Qi, Zhaoyuan Yu, Yingzi Li, Ruopeng Bai, Yu Lan   +6 more
doaj   +1 more source

Tuning the optical properties of BODIPY dye through Cu(I) catalyzed azide-alkyne cycloaddition (CuAAC) reaction

, 2012
Borondipyrromethenes (BODIPY) are a class of fluorescent dyes whose fluorescence quantum yields are generally high and independent of the solvent. In this paper, we report the synthesis of a new type of BODIPY compound that carries an azido group on the ...
Suthiwangcharoen, Nisaraporn, Sun, J (reprint author), Chinese Acad Sci, Chengdu Inst Biol, Nat Prod Ctr, Chengdu 610041, Peoples R China, Xie Fang, Sun Jian, Wang Chao, Wang Qian   +5 more
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Structural decomposition analysis of the cycloaddition reaction.

, 2015
Structural decomposition analysis of the cycloaddition reaction involved in the biosynthesis of Spinosyn A into principal components (the atom numbering was the same as in compound 1 for comparative purpose).
Valentine P. Ananikov (718886), Evgeniy G. Gordeev (718885)   +1 more
core   +1 more source

Chemo- and Regioselective 1,3-Dipolar Cycloaddition of Nitrile Imines to 5-Arylmethylene-2-methylthiohydantoins

Organics
1,3-Dipolar cycloaddition reactions of nitrile imines are a powerful tool for the construction of spirocyclic frameworks, yet controlling chemoselectivity remains challenging when dipolarophiles contain multiple reactive sites.
Maria E. Filkina, Lev A. Lintsov, Victor A. Tafeenko, Maxim E. Kukushkin, Elena K. Beloglazkina   +4 more
doaj   +1 more source

A Molecular Electron Density Theory Study of the Domino [4+2]/[3+2] Cycloaddition Leading to a Tricyclic 1,2-Oxazine Nitrones

Molecules
The reaction of 2,5-dimethylfuran (DMF) with two equivalents of α-nitrosostyrene (NS) leading to a tricyclic 1,2-oxazine nitrone (TON) has been examined theoretically at the ωB97X-D/6-311G(d,p) computational level. In this case, the domino process should
Agnieszka Kącka-Zych, Luis R. Domingo
doaj   +1 more source

Síntese regiosseletiva de cristais líquidos contendo o heterociclo isoxazol [PDF]

, 2008
Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro de Ciências Físicas e Matemáticas. Programa de Pós-Graduação em QuímicaMoléculas com características líquido-cristalinas têm ultimamente atraído um grande interesse por parte de ...
Bryk, Fernando Rebouças
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Effect of the Nature of Surfactant on the Reactivity of C,N-diphenylnitrone towards Acrylonitrile in Different Microemulsions Systems

Chemistry Journal of Moldova: General, Industrial and Ecological Chemistry, 2018
The present work provides an insight into the effect of the nature of surfactant (cationic, anionic), a component of water- and oil-borne microemulsions, on the reaction rate of 1,3-dipolar cycloaddition of C,N-diphenylnitrone with acrylonitrile.
Kahina Hamza, Abdelkader Touati, Ahmed Ait-Yahia, Michel Baltas, Christiane André Barres, Saâd Moulay   +5 more
doaj   +1 more source