Iron-catalyzed transfer hydrogenation of imines assisted by an iron-based Lewis acid

2016 ◽  
Vol 14 (24) ◽  
pp. 5490-5493 ◽  
Author(s):  
Hui-Jie Pan ◽  
Teng Wei Ng ◽  
Yu Zhao
Keyword(s):  
Lewis Acid ◽  
Hydrogen Donor ◽  
Transfer Hydrogenation ◽  
Iron Based ◽  
First Time

An iron-catalyzed transfer hydrogenation of N-aryl and N-alkyl imines using isopropanol as the hydrogen donor is reported for the first time.

Cobalt-catalysed transfer hydrogenation of quinolines and related heterocycles using formic acid under mild conditions

2017 ◽  
Vol 7 (10) ◽  
pp. 1981-1985 ◽  
Author(s):  
Jose R. Cabrero-Antonino ◽  
Rosa Adam ◽  
Kathrin Junge ◽  
Ralf Jackstell ◽  
Matthias Beller
Keyword(s):  
Formic Acid ◽  
Noble Metal ◽  
Hydrogen Donor ◽  
Transfer Hydrogenation ◽  
Time Transfer ◽  
Mild Conditions ◽  
Mild Reduction ◽  
First Time

For the first time, transfer hydrogenation of quinolines and related heterocycles is performed with a non-noble metal based catalyst. [Co(BF4)2·6H2O] in combination with phosphine L1 catalyses selectively, the mild reduction of N-heteroarenes using formic acid as hydrogen donor.

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.

Laser Metal Deposition of Fe- and Co-Based Shape-Memory Alloys

2021 ◽  
Vol 1161 ◽  
pp. 105-112
Author(s):  
Niklas Sommer ◽  
Gabriel Mienert ◽  
Malte Vollmer ◽  
Christian Lauhoff ◽  
Philipp Krooß ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Microstructural Evolution ◽  
Microstructural Analysis ◽  
Metal Deposition ◽  
Thin Wall ◽  
Laser Metal Deposition ◽  
Wall Structures ◽  
Iron Based ◽  
First Time

In the present study, Iron-based FeMnAlNi and Cobalt-based CoNiGa shape-memory alloys (SMA) were processed by laser metal deposition for the first time. The materials show susceptibility to cracking upon processing when unheated substrates are employed. Pre-heating of the substrate materials eliminated cracking completely and enabled robust deposition of thin-wall structures. Microstructural analysis using optical microscopy revealed different microstructural evolution for the two materials considered.

Lewis acid-catalyzed tandem cyclization of in situ generated o-quinone methides and arylsulfonyl hydrazides for a one-pot entry to 3-sulfonylbenzofurans

2019 ◽  
Vol 6 (24) ◽  
pp. 3929-3933 ◽  
Author(s):  
Fan-Xiao Meng ◽  
Ruo-Nan Wang ◽  
Hong-Li Huang ◽  
Shu-Wen Gong ◽  
Qian-Li Li ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Quinone Methides ◽  
One Pot ◽  
Acid Catalyzed ◽  
Tandem Cyclization ◽  
First Time

Lewis acid-mediated one-pot tandem cyclization of o-QMs with arylsulfonyl hydrazides was described for the first time and the corresponding 3-sulfonylbenzofuran products were obtained in moderate to good yields.

scholarly journals Geometry-Wave Potential Quantified and Unified Properties in General Chemistry

2020 ◽  
Author(s):  
Zheng Tian
Keyword(s):  
General Chemistry ◽  
Surface Chemistry ◽  
Lewis Acid ◽  
Self Assembly ◽  
Redox Chemistry ◽  
Acid Base ◽  
Wave Potential ◽  
First Time

Many long-known but never-quantified properties in chapters of general chemistry have for the first time been quantitatively compared and consistently unified, using the newly introduced geometro-wave (GW) potential of particles (i.e. atoms, molecules, clusters, ions, and nanoparticles). Th GW Potential has helped update the electrochemistry, Lewis acid-base chemistry, redox chemistry, self-assembly, surface chemistry, catalysis, and inter-nanoparticle bonding.

scholarly journals Synthesis of Stilbenes Using Various Catalysts and Investigation of their Optical Properties

2021 ◽  
Author(s):  
Pelin Ulukan ◽  
Saron Catak ◽  
Erdal Ertas
Keyword(s):  
Optical Properties ◽  
Lewis Acid ◽  
Suzuki Coupling ◽  
Acid Catalysts ◽  
Coupling Reactions ◽  
Lewis Acid Catalysts ◽  
First Time

Stilbenes substituted with –CN, –OMe and –Br were synthesized using four different Lewis acid catalysts and their reaction efficiencies were compared. In addition to McMurry reagents known in literature, a more familiar and economical catalyst ZnCl2 was used for the first time in our reaction procedures. Furthermore, bromine substituted stilbenes were subjected to Suzuki coupling reactions to append a triphenylamine (TPA) unit, which enhances fluorescence emissions. Solvatochromic properties of synthesized stilbenes were investigated and aggregation caused quenching (ACQ) properties of TPA containing molecules were systematically examined. Optical properties were also theoretically investigated.

Benzothiazoline: Versatile Hydrogen Donor for Organocatalytic Transfer Hydrogenation

2015 ◽  
Vol 48 (2) ◽  
pp. 388-398 ◽  
Author(s):  
Chen Zhu ◽  
Kodai Saito ◽  
Masahiro Yamanaka ◽  
Takahiko Akiyama
Keyword(s):  
Hydrogen Donor ◽  
Transfer Hydrogenation

Lewis Acid Mediated Vinyl-Transfer Reaction of Alkynes toN-Alkylimines by Using theN-Alkyl Residue as a Sacrificial Hydrogen Donor

2013 ◽  
Vol 19 (42) ◽  
pp. 14263-14270 ◽  
Author(s):  
Chandi C. Malakar ◽  
Sara Stas ◽  
Wouter Herrebout ◽  
Kourosch Abbaspour Tehrani
Keyword(s):  
Lewis Acid ◽  
Transfer Reaction ◽  
Hydrogen Donor ◽  
Alkyl Residue

Lewis basicity of relevant monoanions in a non-protogenic organic solvent using a zinc(ii) Schiff-base complex as a reference Lewis acid

2017 ◽  
Vol 46 (35) ◽  
pp. 11608-11614 ◽  
Author(s):  
Ivan Pietro Oliveri ◽  
Santo Di Bella
Keyword(s):  
Schiff Base ◽  
Organic Solvent ◽  
Lewis Acid ◽  
Schiff Base Complex ◽  
Base Complex ◽  
First Time

The Lewis basicity of relevant anions is reported for the first time and compared with that of neutral bases.

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