Catalytic activity of homogeneous and silica-anchored rhodium complexes

1993 ◽  
Vol 50 (1-2) ◽  
pp. 71-74 ◽  
Author(s):  
M. Čapka ◽  
M. Czakoová ◽  
J. Hjortkjaer ◽  
U. Schubert
Keyword(s):  
Catalytic Activity ◽  
Rhodium Complexes

Phosphines with 2-imidazolium ligands enhance the catalytic activity and selectivity of rhodium complexes for hydrosilylation reactions

2010 ◽  
Vol 695 (3) ◽  
pp. 431-436 ◽  
Author(s):  
Jiayun Li ◽  
Jiajian Peng ◽  
Ying Bai ◽  
Guodong Zhang ◽  
Guoqiao Lai ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Rhodium Complexes

scholarly journals Hydrogenation of unactivated enamines to tertiary amines: rhodium complexes of fluorinated phosphines give marked improvements in catalytic activity

2015 ◽  
Vol 11 ◽  
pp. 622-627 ◽  
Author(s):  
Sergey Tin ◽  
Tamara Fanjul ◽  
Matthew L Clarke
Keyword(s):  
Catalytic Activity ◽  
Environmentally Benign ◽  
Acid Extraction ◽  
Rhodium Complexes ◽  
Tertiary Amines

In the hydrogenation of sluggish unactivated enamine substrates, Rh complexes of electron-deficient phosphines are demonstrated to be far more reactive catalysts than those derived from triphenylphosphine. These operate at low catalyst loadings (down to 0.01 mol %) and are able to reduce tetrasubstituted enamines. The use of the sustainable and environmentally benign solvent (R)-limonene for the reaction is also reported with the amine isolated by acid extraction.

Ruthenium- and Rhodium-Catalyzed Ring-Opening Coupling Reactions of Cyclopropenones with Alkenes or Alkynes

Synlett ◽  
2018 ◽  
Vol 29 (06) ◽  
pp. 717-722 ◽  
Author(s):  
Teruyuki Kondo ◽  
Ryosuke Taniguchi ◽  
Yu Kimura
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Methyl Acrylate ◽  
Ring Opening ◽  
Argon Atmosphere ◽  
High Catalytic Activity ◽  
Rhodium Complexes ◽  
Coupling Reactions ◽  
Internal Alkynes ◽  
High Yields

Ru3(CO)12-catalyzed divergent ring-opening coupling reactions of a cyclopropenone with methyl acrylate (an electron-deficient alkene) are developed. Under an argon atmosphere, a decarbonylative linear codimer is obtained, while cyclopentenones are obtained under carbon monoxide (20 atm) without decarbonylation. While ruthenium complexes show no catalytic activity for the ring-opening cocyclization of cyclopropenones with ethylene (20 atm) or bicyclo[2.2.1]hept-2-ene (2-norbornene), rhodium complexes, especially [RhCl(η4-1,5-cod)]2, show high catalytic activity for the desired cocyclization reactions to give the corresponding cyclopentenones in high yields and selectivities. In addition, [RhCl(η4-1,5-cod)]2 realizes the catalytic ring-opening co­cyclization of cyclopropenones with internal alkynes to give the corresponding cyclopentadienones. In all these reactions, ruthena- or rhodacyclobutenones are considered to be key intermediates, generated by strain-driven oxidative addition of a cyclopropenone C–C bond to an ­active ruthenium or rhodium species.

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