A Transition Metal Lewis Acid/Base Triad System for Cooperative Substrate Binding

2013 ◽  
Vol 135 (9) ◽  
pp. 3403-3406 ◽  
Author(s):  
Oscar Tutusaus ◽  
Chengbao Ni ◽  
Nathaniel K. Szymczak
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Substrate Binding ◽  
Acid Base

Development of silica-supported frustrated Lewis pairs: highly active transition metal-free catalysts for the Z-selective reduction of alkynes

2016 ◽  
Vol 6 (3) ◽  
pp. 882-889 ◽  
Author(s):  
Kai C. Szeto ◽  
Wissam Sahyoun ◽  
Nicolas Merle ◽  
Jessica Llop Castelbou ◽  
Nicolas Popoff ◽  
...  
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Selective Reduction ◽  
Frustrated Lewis Pairs ◽  
Acid Base ◽  
Metal Free ◽  
Highly Active ◽  
Active Transition ◽  
Lewis Pairs

Supported Lewis acid/base systems based have been prepared and characterized.

Thermodynamics of several lewis-acid-base stabilized transition metal alloys

1984 ◽  
Vol 15 (11) ◽  
pp. 2075-2085 ◽  
Author(s):  
John K. Gibson ◽  
Leo Brewer ◽  
Karl A. Gingerich
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Metal Alloys ◽  
Acid Base ◽  
Transition Metal Alloys

Coordination Chemistry of N,N′-Bis(diphenylphosphanylmethyl)- 2,3-dihydro-1H-perimidine – Lewis Acid-Base Complexes with the d10-Metals Nickel(0) and Gold(I)

2014 ◽  
Vol 69 (11-12) ◽  
pp. 1299-1305 ◽  
Author(s):  
Sven Krieck ◽  
Daniel Schulze ◽  
Helmar Görls ◽  
Matthias Westerhausen
Keyword(s):  
Coordination Chemistry ◽  
Transition Metal ◽  
Metal Complexes ◽  
Transition Metal Complexes ◽  
Lewis Acid ◽  
Nickel Complexes ◽  
Nickel Atom ◽  
Addition Reactions ◽  
Acid Base ◽  
Tetrahedral Environment

Abstract The addition reactions of N,N′-bis(diphenylphosphanylmethyl)-2,3-dihydro-1H-perimidine (1) with [(cod)2Ni] and [(Ph3P)AuCl] yield yellow [(1)Ni(η4-cod)] (2) and colorless [(1)(Ph3P)AuCl]·3MeOH (3), respectively. In these transition metal complexes of nickel(0) and gold(I) 1 acts as a bidentate chelating ligand. Crystal structures of [(1)Ni(η4-cod)]·3THF (2a) and of cosolvent-free [(1)Ni(η4-cod)] (2) reveal a distorted tetrahedral environment of the nickel atom. The gold(I) atom in 3 exhibits a very long Au-Cl bond of 296.2(1) pm. In contrast to the nickel complexes, compound 3 shows strong agostic interactions between gold(I) and a methylene fragment.

Origins of Lewis acid accelerations in nickel catalysed C–H, C–C and C–O bond cleavages

2021 ◽  
Author(s):  
Han Gao ◽  
Lingfei Hu ◽  
Yanlei Hu ◽  
Xiangying Lv ◽  
Yanbo Wu ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Transition Metal ◽  
Lewis Acid ◽  
Transition Metal Catalysis ◽  
Current Understanding ◽  
Acid Base ◽  
Metal Catalysis

The current understanding of Lewis acid effects in transition metal catalysis is generally based on the enhanced charge transfer from metal to substrate due to the formation of Lewis acid-base...

Carbene-Based Lewis Pairs for Hydrogen Activation

2011 ◽  
Vol 64 (8) ◽  
pp. 1165 ◽  
Author(s):  
Jason W. Runyon ◽  
Oliver Steinhof ◽  
H. V. Rasika Dias ◽  
Joseph C. Calabrese ◽  
William J. Marshall ◽  
...  
Keyword(s):  
Transition Metal ◽  
Hydrogen Storage ◽  
Lewis Acid ◽  
Hydrogen Gas ◽  
Acid Base ◽  
Base Pairs ◽  
Imidazolium Cation ◽  
Hydrogen Activation ◽  
Imidazolium Cations ◽  
Sterically Demanding

A series of Lewis acid–base pairs containing sterically demanding carbenes were investigated for hydrogen activation that could potentially be reversible for use in hydrogen storage applications. When electron-rich boranes are employed as electrophiles, the imidazolium cation is reduced to a 2H-imidazoline (aminal). The aminals were synthesized independently by reduction of imidazolium cations with strong reducing agents. Carbocations were also found to act as electrophiles for hydrogen activation. Preliminary results revealed that it is possible to reduce an alcohol to an alkane using hydrogen gas as a reducing agent in these systems. Finally, it was demonstrated that a transition metal can be used as an electrophile to activate hydrogen through heterolytic cleavage.

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