Results 31 to 40 of about 1,875 (207)

Direct CH Carboxylation Forming Polyfunctionalized Aromatic Carboxylic Acids by Combined Bronsted Bases

, 2022
CO2 fixation into electron-deficient aromatic C–H bonds proceeds with the combined Brønsted bases LiO-t-Bu and LiO-t-Am/CsF/18-crown-6 (t-Am = CEtMe2) under a CO2 atmosphere to afford a variety of polyfunctionalized aromatic carboxylic ...
Masanori Shigeno, Masanori Shigeno (1797376), Kazuya Hanasaka (11977741), Eunsang Kwon (1632397), Kanako Nozawa-Kumada (1528876), Koki Izumi (11977747), Yoshinori Kondo, Itsuki Tohara (11977744), Itsuki Tohara, Hiroyuki Yamakoshi, Hiroyuki Yamakoshi (1825975), Kanako Nozawa-Kumada, Kazuya Hanasaka, Koki Izumi, Eunsang Kwon, Yoshinori Kondo (1528870)   +15 more
core   +1 more source

Glutamic acid as green and bio-based α-amino acid catalyst promoted one-pot access to polyfunctionalized dihydro-2-oxypyrroles [PDF]

Journal of the Serbian Chemical Society, 2019
A highly versatile and convenient synthetic route for biologically active α-amino acid, glutamic acid catalyzed facile and mild preparation of polyfunctionalized dihydro-2-oxypyrroles via one-pot, four condensation domino reaction between aromatic ...
Mohamadpour Farzaneh
doaj   +1 more source

Stereoselective Synthesis of Polyfunctionalized Nitrones through Conjugate Addition of α-Halo Hydrazones to Nitroso Compounds

, 2021
In the presence of Na2CO3, conjugate addition of α-halo hydrazones to nitroso compounds proceeded readily to give polyfunctionalized nitrones in reasonable chemical yields and excellent stereoselectivities.
Zhao, Hong-Wu
core   +1 more source

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

Overcoming the Usual Reactivity of β-Nitroenones: Synthesis of Polyfunctionalized Homoallylic Alcohols and Conjugated Nitrotriene Systems [PDF]

, 2023
Herein, we report a new application of β-nitroenones as valuable building blocks for the preparation of polyfunctionalized homoallylic alcohols; they can be used as key precursors of conjugated nitrotriene systems.
Ballini, R, Palmieri, A, Alessandro Palmieri, Yuan, LX, Petrini, M, Roberto Ballini, Marino Petrini, Khan, MEI, Liudmila Kachalova, Kachalova, L, Lixia Yuan, Muhammad E. I. Khan   +11 more
core   +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

Selective, Oxygen-Tunable, and Metal-Free Functionalization of Polyethylene Through Dual-Mode Nitrosation and Carbonylation. [PDF]

Angew Chem Int Ed Engl
A metal‐free nitrosation process enables direct C–H functionalization of polyethylene (PE) with high selectivity, producing either oxime‐ or carbonyl‐functionalized polymers. Using t‐BuONO under visible light or thermal conditions, the process operates in both lab‐scale and industrial settings.
Cluzeau L, Robert F, Bassani DM, Landais Y, Taton D.   +4 more
europepmc   +2 more sources