scholarly journals Arylation of gem-difluoroalkenes using a Pd/Cu Co-catalytic system that avoids β-fluoride elimination

2021 ◽  
Author(s):  
Kedong Yuan ◽  
Taisiia Feoktistova ◽  
Paul Ha-Yeon Cheong ◽  
Ryan A. Altman
Keyword(s):  
Catalytic System ◽  
Insertion Sequence ◽  
Radical Arylation ◽  
Migratory Insertion

PdII/CuI co-catalyze a desulfitative arylation of aliphatic gem-difluoroalkenes in a radical arylation/migratory insertion sequence that avoids β-F elimination.

Palladium-Catalyzed Carbonylation/Acyl Migratory Insertion Sequence

2010 ◽  
Vol 49 (6) ◽  
pp. 1139-1142 ◽  
Author(s):  
Zhenhua Zhang ◽  
Yiyang Liu ◽  
Mingxing Gong ◽  
Xiaokun Zhao ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Insertion Sequence ◽  
Migratory Insertion ◽  
Palladium Catalyzed

Palladium-Catalyzed Carbonylation/Acyl Migratory Insertion Sequence

2010 ◽  
Vol 122 (6) ◽  
pp. 1157-1160 ◽  
Author(s):  
Zhenhua Zhang ◽  
Yiyang Liu ◽  
Mingxing Gong ◽  
Xiaokun Zhao ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Insertion Sequence ◽  
Migratory Insertion ◽  
Palladium Catalyzed

ChemInform Abstract: Palladium-Catalyzed Carbonylation/Acyl Migratory Insertion Sequence.

ChemInform ◽  
2010 ◽  
Vol 41 (21) ◽  
pp. no-no
Author(s):  
Zhenhua Zhang ◽  
Yiyang Liu ◽  
Mingxing Gong ◽  
Xiaokun Zhao ◽  
Yan Zhang ◽  
...  
Keyword(s):  
Insertion Sequence ◽  
Migratory Insertion ◽  
Palladium Catalyzed

Pilot plant plasma-catalytic system for the decomposition of a volatile organic compound

2016 ◽  
Vol 15 (3) ◽  
pp. 251-259
Author(s):  
Shreedhar Devkota ◽  
◽  
Jin Oh Jo ◽  
Dong Lyong Jang ◽  
Young Jin Hyun ◽  
...  
Keyword(s):  
Organic Compound ◽  
Catalytic System ◽  
Volatile Organic Compound ◽  
Pilot Plant ◽  
Volatile Organic

Cobalt/Lewis Acid Catalysis for Hydrocarbofunctionalization of Alkynes via Cooperative C–H Activation

2020 ◽  
Author(s):  
Chang-Sheng Wang ◽  
Sabrina Monaco ◽  
Anh Ngoc Thai ◽  
Md. Shafiqur Rahman ◽  
Chen Wang ◽  
...  
Keyword(s):  
Catalytic System ◽  
Lewis Acid ◽  
Hydrogen Transfer ◽  
Acid Catalysis ◽  
Rate Limiting Step ◽  
Site Selectivity ◽  
Set Up ◽  
Site Selective ◽  
First Time ◽  
Rate Limiting

A catalytic system comprised of a cobalt-diphosphine complex and a Lewis acid (LA) such as AlMe3 has been found to promote hydrocarbofunctionalization reactions of alkynes with Lewis basic and electron-deficient substrates such as formamides, pyridones, pyridines, and azole derivatives through site-selective C-H activation. Compared with known Ni/LA catalytic system for analogous transformations, the present catalytic system not only feature convenient set up using inexpensive and bench-stable precatalyst and ligand such as Co(acac)3 and 1,3-bis(diphenylphosphino)propane (dppp), but also display distinct site-selectivity toward C-H activation of pyridone and pyridine derivatives. In particular, a completely C4-selective alkenylation of pyridine has been achieved for the first time. Mechanistic stidies including DFT calculations on the Co/Al-catalyzed addition of formamide to alkyne have suggested that the reaction involves cleavage of the carbamoyl C-H bond as the rate-limiting step, which proceeds through a ligand-to-ligand hydrogen transfer (LLHT) mechanism leading to an alkyl(carbamoyl)cobalt intermediate.

Regio-, Stereo- and Enantioselective α-Addition of Carbonyl Nucleo-philes to Allenamides Catalyzed by a Synergistic Copper/Enamine System

2020 ◽  
Author(s):  
Rémi Blieck ◽  
Sebastien Lemouzy ◽  
Marc Taillefer ◽  
Florian Monnier
Keyword(s):  
Catalytic System ◽  
Secondary Amine ◽  
Primary Amine ◽  
Synergistic Catalysis ◽  
Enantioselective Addition ◽  
Amine Catalysts

A dual copper/enamine catalytic system is found to enable an intermolecular enantioselective α-addition of various carbonyl nucleophiles to allenamides. Secondary amine catalysts allowed the highly enantioselective addition of aldehydes, while using primary amine catalysts led to the enantioselective addition of ketoester nucleophiles. The process was found to be highly regio-, stereo- and enantio-selective and represented the first allene hydrofunctionalization using an synergistic catalysis involving copper

Differentiation and Functionalization of Adjacent, Remote C–H Bonds

2019 ◽  
Author(s):  
Hang Shi ◽  
Lu Yi ◽  
Jiang Weng ◽  
Katherine Bay ◽  
Xiangyang Chen ◽  
...  
Keyword(s):  
Catalytic System ◽  
Functional Group ◽  
Hydrocinnamic Acid ◽  
Molecular Architectures ◽  
Site Selective ◽  
Developing Strategies

<p>Site-selective functionalizations of C–H bonds will ultimately afford chemists transformative tools for editing and constructing complex molecular architectures<sup>1-4</sup>. Towards this goal, developing strategies to activate C–H bonds that are distal from a functional group is essential<sup>4-6</sup>. In this context, distinguishing remote C–H bonds on adjacent carbon atoms is an extraordinary challenge due to the lack of electronic or steric bias between the two positions. Herein, we report the design of a catalytic system leveraging a remote directing template and a transient norbornene mediator to selectively activate a previously inaccessible remote C–H bond that is one bond further away. The generality of this approach has been demonstrated with a range of heterocycles, including a complex anti-leukemia agent, and hydrocinnamic acid substrates.</p>

Mild Temperature Copper-Catalyzed Amination of Aryl Halides with Aqueous Ammonia in the Presence of Pyridyldiketone Ligands

2019 ◽  
Author(s):  
Racha Abed Ali Abdine ◽  
Anna Walczak ◽  
Sultan Abu A Aeash ◽  
Gracjan Kurpik ◽  
Artur R. Stefankiewicz ◽  
...  
Keyword(s):  
Catalytic System ◽  
Aqueous Ammonia ◽  
Aryl Halides ◽  
Efficient Coupling ◽  
Ambidentate Ligand ◽  
Mild Temperature

Ambidentate ligand pyridyldiketones were used in combination with copper to catalyze maintain of aryl halides under very mild temperatures. This novel catalytic system allow efficient coupling in one of the smoothest conditions ever reported in literature.

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