Synthesis, Characterisation of Carbon-Bridged (Diphenolato)lanthanide Complexes and Their Catalytic Activity for Diels-Alder Reactions

2005 ◽  
Vol 2005 (4) ◽  
pp. 676-684 ◽  
Author(s):  
Xiaoping Xu ◽  
Mengtao Ma ◽  
Yingming Yao ◽  
Yong Zhang ◽  
Qi Shen
Keyword(s):  
Catalytic Activity ◽  
Lanthanide Complexes ◽  
Diels Alder

scholarly journals Borenium ionic liquids as catalysts for Diels–Alder reaction: tuneable Lewis superacids for catalytic applications

2017 ◽  
Vol 7 (5) ◽  
pp. 1045-1049 ◽  
Author(s):  
K. Matuszek ◽  
S. Coffie ◽  
A. Chrobok ◽  
M. Swadźba-Kwaśny
Keyword(s):  
Catalytic Activity ◽  
Ionic Liquids ◽  
Alder Reaction ◽  
Diels Alder ◽  
Lewis Acidity ◽  
High Catalytic Activity ◽  
Acceptor Number ◽  
Diels Alder Reaction ◽  
Catalytic Applications

Ionic liquids with Lewis superacidic borenium cations were used as catalysts in solvent-less Diels–Alder cycloaddition. The extremely high catalytic activity correlated with the Lewis acidity, expressed as the Gutmann acceptor number.

Lanthanide catalysts for the hetero Diels–Alder reaction: effect of ligand structure and acidity

1997 ◽  
Vol 75 (8) ◽  
pp. 1047-1054 ◽  
Author(s):  
Claude Spino ◽  
Laurel L. Clouston ◽  
David J. Berg
Keyword(s):  
Catalytic Activity ◽  
Vinyl Ether ◽  
Alder Reaction ◽  
Diels Alder ◽  
Ethyl Vinyl Ether ◽  
Ethyl Vinyl ◽  
Catalytic Activities ◽  
Ligand Structure ◽  
Bite Angle ◽  
Diels Alder Reaction

A series of yttrium, ytterbium, and lanthanum hexa-or heptacoordinate complexes were prepared and their catalytic activities tested in the hetero Diels–Alder reaction between crotonaldehyde and ethyl vinyl ether. It was found that a pKa below 7 of the ligand was necessary but not sufficient for catalytic activity. It was determined that the ligand should possess a perfluoromethyl-β-diketonate functionality. Other factors such as bite angle and hinging motion may also play a determining role. Keywords: lanthanide, catalyst, hetero Dielsis–Alder, yttrium, ytterbium, lanthanum.

Synthesis of a heterogeneous artificial metallolipase with chimeric catalytic activity

2015 ◽  
Vol 51 (45) ◽  
pp. 9324-9327 ◽  
Author(s):  
M. Filice ◽  
O. Romero ◽  
J. Gutiérrez-Fernández ◽  
B. de las Rivas ◽  
J. A. Hermoso ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Properties ◽  
Cascade Reactions ◽  
Diels Alder ◽  
Hybrid Catalyst ◽  
Practical Synthesis

The practical synthesis in high overall yields of a heterogeneous artificial copper-lipase with chimeric catalytic activity (native plus artificial) is presented here. This novel hybrid catalyst showed excellent catalytic properties in Diels–Alder and cascade reactions.

scholarly journals New L-Serine Derivative Ligands as Cocatalysts for Diels-Alder Reaction

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Carlos A. D. Sousa ◽  
José E. Rodríguez-Borges ◽  
Cristina Freire
Keyword(s):  
Catalytic Activity ◽  
Lewis Acids ◽  
Alder Reaction ◽  
Diels Alder ◽  
Reaction Yield ◽  
Catalytic Potential ◽  
Diels Alder Reaction ◽  
Good Ability ◽  
Medium Strength

New L-serine derivative ligands were prepared and tested as cocatalyst in the Diels-Alder reactions between cyclopentadiene (CPD) and methyl acrylate, in the presence of several Lewis acids. The catalytic potential of the in situ formed complexes was evaluated based on the reaction yield. Bidentate serine ligands showed good ability to coordinate medium strength Lewis acids, thus boosting their catalytic activity. The synthesis of the L-serine ligands proved to be highly efficient and straightforward.

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