Results 31 to 40 of about 672 (165)

Green Organoselenium Chemistry: Selective Syntheses of New 1,4-Thiaselenine Derivatives Based on Reactions of Thiaselenole Reagent with Alcohols and Water

Inorganics, 2023
Environmentally friendly synthetic methods were developed for the selective preparation of new 2,3-dihydro-1,4-thiaselenine derivatives in high yields based on the reactions of 2-bromomethyl-1,3-thiaselenole with alcohols and water at room temperature ...
Svetlana V. Amosova, Andrey S. Filippov, Nataliya A. Makhaeva, Alexander I. Albanov, Vladimir A. Potapov   +4 more
doaj   +1 more source

Polyfunctionality of the English quantitative words

Journal of Education Culture and Society, 2020
The article in question considers the functioning of quantitative units, their language and speech aspects. Introduction focuses upon the major items of paper – definition of numerals, words of weight and measure, aims, methods of investigation, empiric mate-rial applied, evolution modifications, and perspectives of further study.
openaire   +3 more sources

5,5′-Thiobis(3-bromoisothiazole-4-carbonitrile)

Molbank
The reaction of sodium 2,2-dicyanoethene-1,1-bis(thiolate) with bromine (2 equiv.) in CCl4 gave 3,5-dibromoisothiazole-3-carbonitrile and 5,5′-thiobis(3-bromoisothiazole-4-carbonitrile) in 7% and 18% yields, respectively.
Andreas S. Kalogirou, Panayiotis A. Koutentis   +1 more
doaj   +1 more source

Radical Smiles Rearrangement: An Update

Molecules, 2016
Over the decades the Smiles rearrangement and its variants have become essential synthetic tools in modern synthetic organic chemistry. In this mini-review we summarized some very recent results of the radical version of these rearrangements.
Ingrid Allart-Simon, Stéphane Gérard, Janos Sapi   +2 more
doaj   +1 more source

Diastereoselective Ugi reaction of chiral 1,3-aminoalcohols derived from an organocatalytic Mannich reaction

Beilstein Journal of Organic Chemistry, 2016
Enantiomerically pure β-aminoalcohols, produced through an organocatalytic Mannich reaction, were subjected to an Ugi multicomponent reaction under classical or Lewis acid-promoted conditions with diastereoselectivities ranging from moderate to good ...
Samantha Caputo, Andrea Basso, Lisa Moni, Renata Riva, Valeria Rocca, Luca Banfi   +5 more
doaj   +1 more source

Efficient synthesis of polyfunctionalized carbazoles and pyrrolo[3,4-c]carbazoles via domino Diels–Alder reaction

Beilstein Journal of Organic Chemistry, 2021
The p-TsOH-catalyzed Diels–Alder reaction of 3-(indol-3-yl)maleimides with chalcone in toluene at 60 °C afforded two diastereoisomers of tetrahydropyrrolo[3,4-c]carbazoles, which can be dehydrogenated by DDQ oxidation in acetonitrile at room temperature ...
Ren-Jie Fang, Chen Yan, Jing Sun, Ying Han, Chao-Guo Yan   +4 more
doaj   +1 more source

Acridine yellow G as a photo-induced electron transfer catalyzed radical [4 + 2] aza-Diels-Alder annulation of imines

Results in Chemistry
For the preparation of polyfunctionalized piperidine scaffolds, a radical tandem five-condensation domino Knoevenagel-intramolecular [4 + 2] aza-Diels-Alder imin-based reaction was used.
Farzaneh Mohamadpour
doaj   +1 more source

Pd/C‐Catalyzed Hydrogenation of CF3‐, CF2H‐, and CF2CO2Et‐containing Pyridines: A Robust Method for Highly Functionalized containing Piperidines

Angewandte Chemie International Edition, EarlyView.
A robust and efficient method to access diversely functionalized fluorinated piperidines was developed. The approach features the hydrogenation of polysubstituted pyridines bearing CF3, CF2H, and CF2CO2Et substituents using an inexpensive, readily available heterogeneous Pd/C catalyst under air‐ and moisture‐tolerant conditions, offering an appealing ...
Thibaud Charvillat, Patrick Bernardelli, Marc Daumas, Xavier Pannecoucke, Vincent Ferey, Hassan Oulyadi, Muriel Sebban, Tatiana Besset   +7 more
wiley   +1 more source

Green approaches for the synthesis of poly-functionalized imidazole derivatives: A comprehensive review

Current Research in Green and Sustainable Chemistry, 2021
The naturally occurring five-member imidazole derivatives have shown interesting biological as well as physiochemical properties and consequently they have found several chemicals, optical, pharmaceutical, and other useful biological applications.
Geetika Patel, Devendra Kumar Dewangan, Nikita Bhakat, Subhash Banerjee   +3 more
doaj   +1 more source

Exploring the Fragmentation of Sodiated Species Involving Covalent‐Bond Cleavages for Metabolite Characterization

Rapid Communications in Mass Spectrometry, EarlyView.
ABSTRACT Rationale Electrospray (ESI), the most popular desorption/ionization technique used in mass spectrometry‐based metabolomics, generates both protonated and deprotonated molecules, as well as adduct ions, sodium being the most frequent monoatomic cation entering their composition.
Annelaure Damont, Ekaterina Darii, Chenqin Cao, Anaïs Legrand, Alain Perret, Sylvain Dechaumet, Amina S. Woods, Christophe Junot, Jean‐Claude Tabet, François Fenaille   +9 more
wiley   +1 more source