Catalytic Activity of an Encaged Verkade’s Superbase in a Base-Catalyzed Diels–Alder Reaction

2014 ◽  
Vol 79 (18) ◽  
pp. 8684-8688 ◽  
Author(s):  
Bastien Chatelet ◽  
Véronique Dufaud ◽  
Jean-Pierre Dutasta ◽  
Alexandre Martinez
Keyword(s):  
Catalytic Activity ◽  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction

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.

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.

Preparation of 2,6-Bis(l-menthopyrazol-3-yl)pyridines and Their Catalytic Activity for Asymmetric Diels—Alder Reaction.

ChemInform ◽  
2004 ◽  
Vol 35 (11) ◽  
Author(s):  
Choji Kashima ◽  
Saori Shibata ◽  
Hiroyo Yokoyama ◽  
Takehiko Nishio
Keyword(s):  
Catalytic Activity ◽  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction

Preparation of 2,6-bis(l-menthopyrzol-3-yl)pyridines and their catalytic activity for asymmetric diels alder reaction

2003 ◽  
Vol 40 (5) ◽  
pp. 773-782 ◽  
Author(s):  
Choji Kashima ◽  
Saori Shibata ◽  
Hiroyo Yokoyama ◽  
Takehiko Nishio
Keyword(s):  
Catalytic Activity ◽  
Alder Reaction ◽  
Diels Alder ◽  
Diels Alder Reaction

scholarly journals SuFEx-Click Approach for the Synthesis of Soluble Polymer-Bound MacMillan Catalysts for the Asymmetric Diels–Alder Reaction

Catalysts ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1044
Author(s):  
Woongsup Lee ◽  
Linzi Li ◽  
Byeongmoon Kim
Keyword(s):  
Catalytic Activity ◽  
Catalytic Reaction ◽  
Alder Reaction ◽  
Diels Alder ◽  
Soluble Polymer ◽  
Diels Alder Reaction ◽  
Considerable Loss

Novel polymeric MacMillan catalysts were prepared from modified chiral imidazolidin-4-one monomers via sulfur(VI) fluoride exchange chemistry. The resulting polysulfates containing chiral imidazolidin-4-one units could be employed as polymeric organocatalysts for the asymmetric Diels–Alder reaction. With the use of these polysulfate catalysts, sufficient catalytic activity and enantioselectivity were obtained, which were similar to those obtained by monomeric catalysts in a homogeneous catalytic reaction. In addition, the polysulfate catalysts could be recovered and reused five times without a considerable loss of activity and selectivity.

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