Steric and Electronic Effects of Bidentate Phosphine Ligands on Ruthenium(II)-Catalyzed Hydrogenation of Carbon Dioxide

2016 ◽  
Vol 11 (18) ◽  
pp. 2528-2536 ◽  
Author(s):  
Pan Zhang ◽  
Shao-Fei Ni ◽  
Li Dang
Keyword(s):  
Carbon Dioxide ◽  
Phosphine Ligands ◽  
Electronic Effects ◽  
Bidentate Phosphine ◽  
Hydrogenation Of Carbon Dioxide

scholarly journals Investigations into the ligand steric and electronic effects of Ru-catalyzed C–H bond arylation directed by 8-aminoquinoline as a bidentate-directing group

2020 ◽  
Vol 44 (11-12) ◽  
pp. 705-709
Author(s):  
Hamad H. Al Mamari ◽  
Yousuf Al Lawati
Keyword(s):  
Electronic Properties ◽  
Cone Angle ◽  
Phosphine Ligands ◽  
Steric Effects ◽  
Reaction Yield ◽  
Electronic Effects ◽  
Reaction Efficiency ◽  
Alkyl Amines ◽  
Bidentate Phosphine ◽  
Directing Group

In this study, we report an investigation into the steric (cone angle, θ) and electronic properties of ligands in Ru-catalyzed C–H arylation of aromatic benzamides bearing 8-aminoquinoline as an N,N’-bidentate-directing group. The study employs [RuCl2( p-cymene)]2 as a precatalyst, and a ligand, under study, as a cocatalyst. Various electronically and sterically different monodentate and bidentate phosphine ligands were examined. Other ligands such as phosphites and amines were also tested. The study reveals that while bidentate phosphines, phosphites, and aryl and alkyl amines were found to be ineffective, monodentate triarylphosphines represented by triphenylphosphine were found to be the most effective ligands in the Ru-catalyzed C–H arylation under the conditions specified. In addition, the study reveals that there is a correlation between the steric effects, cone angle (θ) and the reaction efficiency. Thus, for symmetrical phosphine ligands, as the cone angle increases, the yield of the CH arylation product gradually decreased. Moreover, the electronic properties of triarylphosphine ligands influenced the reaction as demonstrated by the decreased ability of electron-poor ligands to promote the reaction. The study also reveals a correlation between the electronic parameter, υCO, of the triarylphosphine ligand and the reaction efficiency. As the carbonyl stretching frequency increases, the reaction yield gradually decreased.

Catalytic Hydrogenation of Carbon Dioxide to Fuels

2014 ◽  
Vol 18 (10) ◽  
pp. 1335-1345 ◽  
Author(s):  
Xuecheng Yan ◽  
Han Guo ◽  
Dongjiang Yang ◽  
Shilun Qiu ◽  
Xiangdong Yao
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Hydrogenation ◽  
Hydrogenation Of Carbon Dioxide

Mono- and Bidentate Phosphine Ligands in the Palladium-Catalyzed Methyl Acrylate Dimerization

2003 ◽  
Vol 345 (3) ◽  
pp. 402-409 ◽  
Author(s):  
Jörg Zimmermann ◽  
Igor Tkatchenko ◽  
Peter Wasserscheid
Keyword(s):  
Methyl Acrylate ◽  
Phosphine Ligands ◽  
Palladium Catalyzed ◽  
Bidentate Phosphine
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