Results 11 to 20 of about 44,314 (270)

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
doaj   +1 more source

Cycloaddition Reactions of Heterophospholes

ChemInform, 2004
AbstractFor Abstract see ChemInform Abstract in Full Text.
Raj K. Bansal, Neelima Gupta, Nidhi Gupta   +2 more
openaire   +1 more source

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,
Mayr, Herbert, Heigl, Ulrich W., Baran, Janusz   +2 more
core   +1 more source

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
doaj   +1 more source

Photocatalytic Cycloaddition Reaction of Triarylphosphines with Alkynes Forming Cyclic Phosphonium Salts

, 2021
Herein reported is a photocatalytic cycloaddition reaction of triarylphosphines with alkynes. Phosphonium salts of unique bicyclic structures are synthesized through a radical pathway under mild reaction conditions. The phosphonium salts are subjected to
Yusuke, Masuda, Daichi, Ikeshita, Masahiro, Murakami   +2 more
core   +1 more source

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
doaj   +1 more source

Intramolecular Imino Diels-Alder Reaction: Progress toward the Synthesis of Uncialamycin [PDF]

, 2009
We herein described an intramolecular imino Diels-Alder reaction promoted with BF3.OEt2/DDQ affording substituted quinolines. Using this procedure, we prepared the chiral quitioline moiety of the uncialamycin, a new enediyne natural ...
Pierre van de Weghe, van de Weghe, Pierre, Desrat, S, Desrat, Sandy, van de Weghe, P, Sandy Desrat   +5 more
core   +1 more source

[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
doaj   +1 more source