Results 11 to 20 of about 73,410 (278)

Ab initio study of the mechanism of forming a spiro-Si-heterocyclic ring compound involving Ge from H2Ge=Si: and acetaldehyde [PDF]

Journal of the Serbian Chemical Society, 2016
The H2Ge=Si: and its derivatives(X2Ge=Si:, X = H, Me, F, Cl, Br, Ph, Ar……) is a new species. Its cycloaddition reactions is a new area for the study of silylene chemistry.
Lu Xiuhui, Ming Jingjing
doaj   +1 more source

The Synthesis of the Hydrogenated Thiophenes by [3+2] Cycloaddition Reaction of Thiocarbonyl Ylide

Журнал органічної та фармацевтичної хімії, 2023
Aim. To study the use of chloromethyl trimethylsilylmethyl sulfide as a precursor of thiocarbonyl ylide in [3+2] cycloaddition reaction to a number of α,β-unsaturated compounds and to establish the regularities of the reaction course.
Tymofii V. Rudenko, Vadim M. Timoshenko
doaj   +1 more source

On the Question of Zwitterionic Intermediates in the [3 + 2] Cycloaddition Reactions between C-arylnitrones and Perfluoro 2-Methylpent-2-ene

Molecules, 2021
The molecular mechanism of the [3 + 2] cycloaddition reaction between C-arylnitrones and perfluoro 2-methylpent-2-ene was explored on the basis of DFT calculations. It was found that despite the polar nature of the intermolecular interactions, as well as
Katarzyna Mitka, Katarzyna Fela, Aleksandra Olszewska, Radomir Jasiński   +3 more
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The [4+2]‐Cycloaddition of α‐Nitrosoalkenes with Thiochalcones as a Prototype of Periselective Hetero‐Diels–Alder Reactions—Experimental and Computational Studies [PDF]

, 2020
The [4+2]‐cycloadditions of α‐nitrosoalkenes with thiochalcones occur with high selectivity at the thioketone moiety of the dienophile providing styryl‐substituted 4H‐1,5,2‐oxathiazines in moderate to good yields.
Boger D. L., Carruthers W., Corey E. J., Fleming I., Huisgen R., Huisgen R., Reissig H.-U., Warren S., Zweifel G. S.   +8 more
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A Stepwise [4 + 3] Cycloaddition Reaction of the 1,3-Diphenyl-2-azaallyl Anion [PDF]

, 1993
The 1,3-diphenyl-2-azaallyl anion (1) undergoes [3 + 2] cycloaddition reactions with the s-cis-fixed 1,3-dienes 8-11. In contrast, 1,1,2,2,3,3-hexamethyl-4,5-bis(methylene)cyclopentane (7) reacts with 1 to give the [4 + 3] cycloadduct 13 and the linear 1,
Anh, Baran, Baran, Baran, Baran, Baran, Blomquist, Boche, Boche, Bower, Eidenschink, Fleming, Huisgen, Juday, Kauffmann, Kauffmann, Kaufmann, Mayr, Mayr, Mayr, Mayr, van Straten, Wilcox, Woodward   +23 more
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Synthesis of 3,4,5-trisubstituted isoxazoles in water via a [3 + 2]-cycloaddition of nitrile oxides and 1,3-diketones, β-ketoesters, or β-ketoamides

Beilstein Journal of Organic Chemistry, 2022
Herein we report a method for the synthesis of 3,4,5-trisubstituted isoxazoles in water under mild basic conditions at room temperature via a [3 + 2]-cycloaddition of nitrile oxides and 1,3-diketones, β-ketoesters, or β-ketoamides.
Md Imran Hossain, Md Imdadul H. Khan, Seong Jong Kim, Hoang V. Le   +3 more
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On the Question of Zwitterionic Intermediates in the [3+2] Cycloaddition Reactions between Aryl Azides and Ethyl Propiolate

Molecules, 2023
The molecular mechanism of the [3+2] cycloaddition reactions between aryl azides and ethyl propiolate was evaluated in the framework of the Molecular Electron Density Theory.
Ewa Dresler, Przemysław Woliński, Aneta Wróblewska, Radomir Jasiński   +3 more
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Discovery of new mutually orthogonal bioorthogonal cycloaddition pairs through computational screening. [PDF]

, 2015
Density functional theory (DFT) calculations and experiments in tandem led to discoveries of new reactivities and selectivities involving bioorthogonal sydnone cycloadditions.
Houk, KN, Liang, Yong, Murphy, Jennifer M, Narayanam, Maruthi Kumar   +3 more
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[Bmim]Br Accelerated One-Pot Three-Component Cascade Protocol for the Construction of Spirooxindole–Pyrrolidine Heterocyclic Hybrids

Molecules, 2020
Our synthetic approach for the assembly of structurally complex spirooxindole heterocyclic hybrids was based on an ionic liquid, [bmim]Br mediated one-pot three-component cascade reaction strategy involving 1,3-dipolar cycloaddition reaction of N-1-(2 ...
Raju Suresh Kumar, Dhaifallah M. Al-thamili, Abdulrahman I. Almansour, Natarajan Arumugam, Necmi Dege   +4 more
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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