scholarly journals In Situ Generated Cobalt Catalyst for the Dehydrogenative Coupling of Alcohols and Amines into Imines

ChemCatChem ◽  
2019 ◽  
Vol 11 (11) ◽  
pp. 2707-2712 ◽  
Author(s):  
Fabrizio Bottaro ◽  
Robert Madsen
Keyword(s):  
Cobalt Catalyst ◽  
Dehydrogenative Coupling

scholarly journals A cross-dehydrogenative C(sp3)−H heteroarylation via photo-induced catalytic chlorine radical generation

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Chia-Yu Huang ◽  
Jianbin Li ◽  
Chao-Jun Li
Keyword(s):  
Hydrogen Atom ◽  
Hydrogen Evolution ◽  
Alkyl Radical ◽  
Cobalt Catalyst ◽  
Alkylation Reaction ◽  
Hydrogen Atom Abstraction ◽  
Dehydrogenative Coupling ◽  
Radical Generation ◽  
Limited Scope

AbstractHydrogen atom abstraction (HAT) from C(sp3)–H bonds of naturally abundant alkanes for alkyl radical generation represents a promising yet underexplored strategy in the alkylation reaction designs since involving stoichiometric oxidants, excessive alkane loading, and limited scope are common drawbacks. Here we report a photo-induced and chemical oxidant-free cross-dehydrogenative coupling (CDC) between alkanes and heteroarenes using catalytic chloride and cobalt catalyst. Couplings of strong C(sp3)–H bond-containing substrates and complex heteroarenes, have been achieved with satisfactory yields. This dual catalytic platform features the in situ engendered chlorine radical for alkyl radical generation and exploits the cobaloxime catalyst to enable the hydrogen evolution for catalytic turnover. The practical value of this protocol was demonstrated by the gram-scale synthesis of alkylated heteroarene with merely 3 equiv. alkane loading.

scholarly journals C2-Alkylation of N-pyrimidylindole with vinylsilane via cobalt-catalyzed C–H bond activation

2012 ◽  
Vol 8 ◽  
pp. 1536-1542 ◽  
Author(s):  
Zhenhua Ding ◽  
Naohiko Yoshikai
Keyword(s):  
Reaction Temperature ◽  
Cobalt Catalyst ◽  
Bond Activation

Direct C2-alkylation of an indole bearing a readily removable N-pyrimidyl group with a vinylsilane was achieved by using a cobalt catalyst generated in situ from CoBr2, bathocuproine, and cyclohexylmagnesium bromide. The reaction allows coupling between a series of N-pyrimidylindoles and vinylsilanes at a mild reaction temperature of 60 °C, affording the corresponding alkylated indoles in moderate to good yields.

In situ and operando structural characterisation of a Fischer–Tropsch supported cobalt catalyst

2011 ◽  
Vol 171 (1) ◽  
pp. 186-191 ◽  
Author(s):  
Amélie Rochet ◽  
Virginie Moizan ◽  
Christophe Pichon ◽  
Fabrice Diehl ◽  
Adrien Berliet ◽  
...  
Keyword(s):  
Cobalt Catalyst ◽  
Fischer Tropsch ◽  
Structural Characterisation

Highly regioselective α-formylation and α-acylation of BODIPY dyes via tandem cross-dehydrogenative coupling with in situ deprotection

2019 ◽  
Vol 17 (20) ◽  
pp. 5121-5128 ◽  
Author(s):  
Fan Lv ◽  
Yang Yu ◽  
Erhong Hao ◽  
Changjiang Yu ◽  
Hua Wang ◽  
...  
Keyword(s):  
Dehydrogenative Coupling

An efficient protocol for the regioselective C–H α-formylation and α-acylation of BODIPY dyes using dioxolane derivatives as aldehyde equivalents is reported.

Synchrotron radiation in situ X-ray absorption fine structure and in situ X-ray diffraction analysis of a high-performance cobalt catalyst towards the oxygen reduction reaction

2017 ◽  
Vol 19 (45) ◽  
pp. 30749-30755
Author(s):  
Haiying Qin ◽  
Longxia Lin ◽  
Junkang Jia ◽  
Huangliang Ni ◽  
Yan He ◽  
...  
Keyword(s):  
Fine Structure ◽  
Synchrotron Radiation ◽  
Diffraction Analysis ◽  
High Performance ◽  
Cobalt Catalyst ◽  
Reduction Reaction ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption

The evolution of metallic Co to Co(OH)2 and then to CoOOH during the ORR was revealed by in situ XRD combined with in situ XAFS tests.

Fischer-Tropsch process in a three-phase system over iron-cobalt catalyst nanoparticles in situ synthesized in a hydrocarbon medium

2014 ◽  
Vol 54 (2) ◽  
pp. 88-93 ◽  
Author(s):  
S. N. Khadzhiev ◽  
S. A. Sagitov ◽  
A. S. Lyadov ◽  
M. V. Kulikova ◽  
A. Yu. Krylova
Keyword(s):  
Cobalt Catalyst ◽  
Phase System ◽  
Fischer Tropsch ◽  
Catalyst Nanoparticles ◽  
Iron Cobalt ◽  
Hydrocarbon Medium ◽  
Three Phase

Heterogeneous-Gold-Catalyzed Acceptorless Cross-Dehydrogenative Coupling of Hydrosilanes and Isocyanic Acid Generated in situ from Urea

2013 ◽  
Vol 125 (32) ◽  
pp. 8578-8581 ◽  
Author(s):  
Kento Taniguchi ◽  
Shintaro Itagaki ◽  
Kazuya Yamaguchi ◽  
Noritaka Mizuno
Keyword(s):  
Isocyanic Acid ◽  
Dehydrogenative Coupling
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