Electronic Effects in Asymmetric Catalysis. Synthesis and Structure of Model Rhodium Complexes Containing Ferrocenyl Ligands for Use in the Hydroboration Reaction

1997 ◽  
Vol 16 (2) ◽  
pp. 255-260 ◽  
Author(s):  
Anita Schnyder ◽  
Antonio Togni ◽  
Ursula Wiesli
Keyword(s):  
Asymmetric Catalysis ◽  
Rhodium Complexes ◽  
Electronic Effects ◽  
Ferrocenyl Ligands

The oxidative coupling between benzaldehyde derivatives and phenylacetylene catalyzed by rhodium complexes via C-H bond activation

2020 ◽  
Vol 26 (1) ◽  
pp. 20-25
Author(s):  
Xinyi Zhao ◽  
Hongge Jia ◽  
Qingji Wang ◽  
Heming Song ◽  
Yanan Tang ◽  
...  
Keyword(s):  
Amino Acid ◽  
Oxidative Coupling ◽  
Bond Activation ◽  
Coupling Reaction ◽  
Reaction Yield ◽  
Rhodium Complexes ◽  
Electronic Effects ◽  
Oxidative Coupling Reaction ◽  
Excellent Activity ◽  
Benzaldehyde Derivatives

AbstractThis paper reports the use of rhodium (Rh) catalysts for the oxidative coupling reaction between phenylacetylene and benzaldehyde derivatives via C-H bond activation. These reactions were catalyzed by Rh(l-amino acid)(cod) (the l-amino acid is l-phenylalanine, l-valine or l-proline; cod is 1,5-cyclooctadiene) to obtain chromones in 12.7–88.3% yield. These new Rh catalysts have excellent activity for the coupling reaction between phenylacetylene and different benzaldehyde derivatives. It was found that the electronic effects of the benzaldehyde derivative substituent affected the reaction yield, which is in accordance with the proposed mechanism.

New Ferrocenyl Ligands with Broad Applications in Asymmetric Catalysis

2002 ◽  
Vol 114 (24) ◽  
pp. 4902-4905 ◽  
Author(s):  
Matthias Lotz ◽  
Kurt Polborn ◽  
Paul Knochel
Keyword(s):  
Asymmetric Catalysis ◽  
Ferrocenyl Ligands

Synthesis, characterization, and application in asymmetric catalysis of dendrimers containing chiral ferrocenyl diphosphines

2001 ◽  
Vol 79 (11) ◽  
pp. 1762-1774 ◽  
Author(s):  
Christoph Köllner ◽  
Antonio Togni
Keyword(s):  
Asymmetric Catalysis ◽  
Isophthalic Acid ◽  
Tricarboxylic Acid ◽  
Catalytic Reactions ◽  
Allylic Substitution ◽  
Asymmetric Catalytic ◽  
Ferrocenyl Ligands ◽  
The One ◽  
Parent Ligand ◽  
Dimethyl Itaconate

Starting from the functionalized Josiphos derivatives (R)-1-[(S)-2-(diphenylphosphino)-1'-(dimethyl-3''-aminopropylsilyl)-ferrocenyl]ethyldicyclohexylphosphine ((R)-(S)-3), (R)-1-[(S)-2-(diphenylphosphino)-1'-(hydroxy methyl) ferrocenyl]ethyldicyclohexylphosphine ((R)-(S)-4), and (R)-1-[(S)-2-(diphenylphosphino)-1'-(3''-hydroxy propyl)ferrocenyl]ethyldicyclohexylphosphine ((R)-(S)-5), a series of dendrimers containing up to sixteen ferrocenyl diphosphine units were prepared. Dendrimer cores are based on benzene 1,3,5-tricarboxylic acid and 1,3,5,7-adaman tanetetracarboxylic acid, with 5-substituted isophthalic acid derivatives constituting the branching units. The dendrimers have been used in three different asymmetric catalytic reactions: Rh-catalyzed hydrogenation of dimethyl itaconate, Pd-catalyzed allylic substitution, and Rh-catalyzed hydroboration of styrene with catecholborane. In all three reactions the selectivity obtained with the dendrimers was very similar to the one obtained with the parent ligand Josiphos.Key words: dendrimer, asymmetric catalysis, ferrocenyl ligands, hydrogenation.

ChemInform Abstract: Dendrimers Based on Cyclophosphazene Units and Containing Chiral Ferrocenyl Ligands for Asymmetric Catalysis.

ChemInform ◽  
2010 ◽  
Vol 31 (10) ◽  
pp. no-no
Author(s):  
Raoul Schneider ◽  
Christoph Koellner ◽  
Immo Weber ◽  
Antonio Togni
Keyword(s):  
Asymmetric Catalysis ◽  
Ferrocenyl Ligands

Some New Aspects of Asymmetric Catalysis with Chiral Ferrocenyl Ligands

1999 ◽  
pp. 51-61
Author(s):  
Antonio Togni ◽  
Romano Dorta ◽  
Christoph Köllner ◽  
Giorgio Pioda
Keyword(s):  
Asymmetric Catalysis ◽  
Ferrocenyl Ligands
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