Active Pd(II) Complexes as Either Lewis Acid Catalysts or Transition Metal Catalysts

2005 ◽  
pp. 279-321 ◽  
Author(s):  
Koichi Mikami ◽  
Manabu Hatano ◽  
Katsuhiro Akiyama
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts

Metathetical Degradation and Depolymerization of Unsaturated Polymers

1997 ◽  
Vol 70 (3) ◽  
pp. 519-529 ◽  
Author(s):  
J. C. Marmo ◽  
K. B. Wagener
Keyword(s):  
Molecular Weight ◽  
Transition Metal ◽  
Catalytic System ◽  
Lewis Acid ◽  
Catalyst System ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Side Reactions

Abstract The employment of transition metal catalysts has been a viable route in the degradation and depolymerization of unsaturated polymers. Initially, unsaturated polymers were degraded with a catalytic system containing a transition metal and a Lewis acid cocatalyst (WCl6/SnBu4). Degradation chemistry was effective in reducing the molecular weight of the polymer, however, the classical catalyst system induces side reactions which generates ill-defined products. These side reactions were obviated by using a preformed alkylidene without a Lewis acid cocatalyst, and perfectly difunctional telechelics were synthesized.

scholarly journals Double metal cyanides as heterogeneous Lewis acid catalysts for nitrile synthesis via acid-nitrile exchange reactions

2019 ◽  
Vol 55 (86) ◽  
pp. 12984-12987
Author(s):  
Carlos Marquez ◽  
Matthieu Corbet ◽  
Simon Smolders ◽  
Philippe Marion ◽  
Dirk De Vos
Keyword(s):  
Transition Metal ◽  
Exchange Reaction ◽  
Lewis Acid ◽  
Acid Catalysts ◽  
Exchange Reactions ◽  
Lewis Acid Catalysts ◽  
Metal Cyanides ◽  
Acid Nitrile

A series of transition metal-based double metal cyanides (DMCs) were studied as catalysts for the synthesis of nitriles via acid-nitrile exchange reaction.

ChemInform Abstract: Homogeneous Catalysis. Transition Metal Based Lewis Acid Catalysts.

ChemInform ◽  
2010 ◽  
Vol 24 (43) ◽  
pp. no-no
Author(s):  
T. K. HOLLIS ◽  
W. ODENKIRK ◽  
N. P. ROBINSON ◽  
J. WHELAN ◽  
B. BOSNICH
Keyword(s):  
Transition Metal ◽  
Homogeneous Catalysis ◽  
Lewis Acid ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts

Synthesis and Applications of Chiral Bicyclic Bisborane Catalysts

Synthesis ◽  
2021 ◽  
Author(s):  
Zhao-Ying Yang ◽  
Ming Zhang ◽  
Xiao-Chen Wang
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Asymmetric Hydrogenation ◽  
Acid Catalysts ◽  
Frustrated Lewis Pairs ◽  
Lewis Acid Catalysts ◽  
Lewis Bases ◽  
Metal Free ◽  
Hydrogenation Reactions ◽  
Acid Catalyzed

The development of chiral borane Lewis acid catalysts opened the door for transition-metal-free catalyzed asymmetric organic reactions. Herein, we have summarized our work on the preparation of two classes of novel chiral bicyclic bisborane Lewis acid catalysts derived from C2-symmetric [3.3.0] dienes and [4.4] dienes, respectively. These catalysts not only form frustrated Lewis pairs with Lewis bases to catalyze asymmetric hydrogenation reactions but also activate Lewis basic functional groups in traditional Lewis acid catalyzed asymmetric reactions.

Homogeneous catalysis. transition metal based lewis acid catalysts.

Tetrahedron ◽  
1993 ◽  
Vol 49 (25) ◽  
pp. 5415-5430 ◽  
Author(s):  
T. Keith Hollis ◽  
William Odenkirk ◽  
N.P. Robinson ◽  
John Whelan ◽  
B. Bosnich
Keyword(s):  
Transition Metal ◽  
Homogeneous Catalysis ◽  
Lewis Acid ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts

scholarly journals Synthesis of 3,3′-Disubstituted Indolenines Utilizing the Lewis Acid Catalyzed Alkylation of 2,3-Disubstituted Indoles with Trichloroacetimidates

Synlett ◽  
2017 ◽  
Vol 28 (17) ◽  
pp. 2335-2339 ◽  
Author(s):  
John Chisholm ◽  
Arijit Adhikari ◽  
Léa Radal
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Acid Catalysts ◽  
Lewis Acid Catalysts ◽  
Reaction Conditions ◽  
Complex Molecules ◽  
Synthetic Intermediates ◽  
Acid Catalyzed ◽  
Metal Catalyzed ◽  
Effective Reaction

Trichloroacetimidates function as effective electrophiles for the selective C3-alkylation of 2,3-disubstituted indoles to provide 3,3′-disubstituted indolenines. These indolenines are common synthetic intermediates that are often utilized in the synthesis of complex molecules. Effective reaction conditions utilizing Lewis acid catalysts have been determined, and the scope of the reaction with respect to indole and imidate reaction partner has been investigated. This chemistry provides an alternative to base promoted and transition-metal-catalyzed methods that are more commonly utilized to access similar indolenines.

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