scholarly journals A π–Cu(II)−π Complex as an Extremely Active Catalyst for Enantioselective α-Halogenation of N-Acyl-3,5-dimethylpyrazoles

ACS Catalysis ◽  
2022 ◽  
pp. 1012-1017
Author(s):  
Kazuki Nishimura ◽  
Yanzhao Wang ◽  
Yoshihiro Ogura ◽  
Jun Kumagai ◽  
Kazuaki Ishihara
Keyword(s):  
Active Catalyst ◽  
Π Complex

Aromatic Hydrogen Isotope Exchange Reactions Catalyzed by Iridium Complexes in Aqueous Solution

1995 ◽  
Vol 48 (1) ◽  
pp. 79 ◽  
Author(s):  
CA Lukey ◽  
MA Long ◽  
JL Garnett
Keyword(s):  
Hydrogen Isotope ◽  
Isotope Exchange ◽  
Active Catalyst ◽  
Good Evidence ◽  
Ion Concentration ◽  
Iridium Complexes ◽  
Exchange Reactions ◽  
Hydrogen Ion Concentration ◽  
Hydrogen Isotope Exchange ◽  
Π Complex

Sodium hexachloroiridate (III) and sodium hexachloroiridate (IV) have been used as homogeneous catalysts for hydrogen isotope exchange between benzenoid compounds and water. The ideal solvent consisted of 50 mole % acetic acid/water, and the optimum temperature was found to be 160°C. Under these conditions the rate of incorporation of deuterium into benzene was significant (typically 15% D in 6 h), and reduction to iridium metal was minimized. The active catalytic species was identified as a solvated iridium(III) species, which is also postulated to be the active catalyst in solutions containing hexachloroiridate (IV). The kinetics of exchange in benzene catalysed by sodium hexachloroiridate (III) were elucidated, and found to be more complex than for the corresponding sodium tetrachloroplatinate (II) catalysed exchange, in that a two-term rate dependence was found for catalyst concentration and the reaction was inversely dependent on hydrogen ion concentration. The reaction was found to be independent of chloride ion concentration, this confirming that the active catalyst is a solvated species. Isotopic labelling in all compounds was confined to the aromatic ring, and most substituted benzenes exhibited deactivation of the ortho positions, indicating that a dissociative π-complex exchange mechanism was operating. This was confirmed by exchange into naphthalene, where it was found that labelling was predominantly in the β position. Facile exchange into nitrobenzene provided good evidence of homogeneous catalysis, and not catalysis by precipitated metal.

Co3O4-CuCoO2 hybrid nanoplates as a low-cost and highly active catalyst for producing hydrogen from ammonia borane

2021 ◽  
Author(s):  
Yufa Feng ◽  
Jinyun Liao ◽  
Xiaodong Chen ◽  
Qingyu Liao ◽  
Huize Wang ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Active Catalyst ◽  
Low Cost ◽  
Ammonia Borane ◽  
Catalytic Materials ◽  
Highly Active ◽  
Promising Strategy

Developing low-cost and highly active hydrolysis catalytic materials for the dehydrogenation of hydrogen-rich chemicals is a promising strategy to store and easily release hydrogen for fuel cell applications. In this...

A copper(II) complex with rare μ1,1,1-azide ligand: Active catalyst for heterogeneous olefin epoxidation

2008 ◽  
Vol 11 (3) ◽  
pp. 265-269 ◽  
Author(s):  
Partha Roy ◽  
Koushik Dhara ◽  
Mario Manassero ◽  
Pradyot Banerjee
Keyword(s):  
Active Catalyst ◽  
Olefin Epoxidation ◽  
Azide Ligand

ChemInform Abstract: π-Complex Formation and Collapse in Electrophilic Halogenation of Aromatic Substrates.

ChemInform ◽  
1987 ◽  
Vol 18 (47) ◽  
Author(s):  
O. M. E. EL-DUSOUQUI ◽  
K. A. M. MAHMUD ◽  
Y. SULFAB
Keyword(s):  
Complex Formation ◽  
Aromatic Substrates ◽  
Π Complex

[RuV(NCN-Me)(bpy)(O)]3+ mediated efficient photo-driven water oxidation

RSC Advances ◽  
2016 ◽  
Vol 6 (66) ◽  
pp. 61959-61965 ◽  
Author(s):  
Jully Patel ◽  
Karunamay Majee ◽  
Sumanta Kumar Padhi
Keyword(s):  
Electron Acceptor ◽  
Water Oxidation ◽  
Phosphate Buffer ◽  
Active Catalyst

The complex [Ru(NCN-Me)(bpy)H2O](PF6)2 acts as an active catalyst for the photo-driven oxidation of water, when employed with [Ru(bpy)3]2+ as photosensitizer and Na2S2O8 as sacrificial electron acceptor at pH 6.5 phosphate buffer, with a TON of 130.

Crystal structure of meso ‐substituted pyrazolyl porphyrin complexes and their highly active catalyst for oxidation of alkylbenzenes

2017 ◽  
Vol 32 (3) ◽  
pp. e4184 ◽  
Author(s):  
Yahong Yao ◽  
Yanxia Du ◽  
Jun Li ◽  
Chen Wang ◽  
Zengqi Zhang ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Active Catalyst ◽  
Highly Active
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