scholarly journals Studies on a catalytic version of the Matteson asymmetric homologation reaction

2021 ◽  
Author(s):  
Keith Smith ◽  
Basil A. Saleh ◽  
Mohammed Alshammari ◽  
Gamal A. El-Hiti ◽  
Mark Elliott
Keyword(s):  
Catalytic Systems ◽  
Organolithium Reagents ◽  
Catalytic Asymmetric

Studies of a catalytic asymmetric version of the Matteson reaction between dichloromethylboronates and organolithium reagents have been undertaken. From several different chiral catalytic systems studied, only one based on a...

ChemInform Abstract: Catalytic Asymmetric Addition of Organolithium Reagents to Aldehydes.

ChemInform ◽  
2016 ◽  
Vol 47 (31) ◽  
Author(s):  
Marcos Veguillas ◽  
Ricard Sola ◽  
Luke Shaw ◽  
Beatriz Macia
Keyword(s):  
Asymmetric Addition ◽  
Organolithium Reagents ◽  
Catalytic Asymmetric

scholarly journals Catalytic Asymmetric Addition of Organolithium Reagents to Aldehydes

2016 ◽  
Vol 2016 (9) ◽  
pp. 1788-1794 ◽  
Author(s):  
Marcos Veguillas ◽  
Ricard Solà ◽  
Luke Shaw ◽  
Beatriz Maciá
Keyword(s):  
Asymmetric Addition ◽  
Organolithium Reagents ◽  
Catalytic Asymmetric

scholarly journals Iron-catalysed cross-coupling of organolithium compounds with organic halides

2016 ◽  
Vol 7 (1) ◽  
Author(s):  
Zhenhua Jia ◽  
Qiang Liu ◽  
Xiao-Shui Peng ◽  
Henry N. C. Wong
Keyword(s):  
Noble Metals ◽  
Cross Coupling ◽  
High Reactivity ◽  
Coupling Reactions ◽  
Catalytic Systems ◽  
Organolithium Compounds ◽  
Cross Coupling Reactions ◽  
Carbon Carbon Bond ◽  
Organic Halides ◽  
Organolithium Reagents

Abstract In past decades, catalytic cross-coupling reactions between organic halides and organometallic reagents to construct carbon–carbon bond have achieved a tremendous progress. However, organolithium reagents have rarely been used in cross-coupling reactions, due mainly to their high reactivity. Another limitation of this transformation using organolithium reagents is how to control reactivity with excellent selectivity. Although palladium catalysis has been applied in this field recently, the development of an approach to replace catalytic systems of noble metals with nonprecious metals is currently in high demand. Herein, we report an efficient synthetic protocol involving iron-catalysed cross-coupling reactions employing organolithium compounds as key coupling partners to unite aryl, alkyl and benzyl fragments and also disclose an efficient iron-catalysed release-capture ethylene coupling with isopropyllithium.

Catalytic Activity of Binary and Triple Systems Based on Redox Inactive Metal Compound, LiSt and Additives of Monodentate Ligands-Modifiers: DMF, HMPA and PhOH, in Selective Ethylbenzene Oxidation with Dioxygen

2016 ◽  
Vol 10 (3) ◽  
pp. 259-270
Author(s):  
Ludmila Matienko ◽  
◽  
Larisa Mosolova ◽  
Vladimir Binyukov ◽  
Gennady Zaikov ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Triple System ◽  
Metal Compound ◽  
Ethylbenzene Oxidation ◽  
Catalytic Systems ◽  
Triple Systems ◽  
Lithium Compound ◽  
Mechanism Of Catalysis ◽  
Monodentate Ligands

Mechanism of catalysis with binary and triple catalytic systems based on redox inactive metal (lithium) compound {LiSt+L2} and {LiSt+L2+PhOH} (L2=DMF or HMPA), in the selective ethylbenzene oxidation by dioxygen into -phenylethyl hydroperoxide is researched. The results are compared with catalysis by nickel-lithium triple system {NiII(acac)2+LiSt+PhOH} in selective ethylbenzene oxidation to PEH. The role of H-bonding in mechanism of catalysis is discussed. The possibility of the stable supramolecular nanostructures formation on the basis of triple systems, {LiSt+L2+PhOH}, due to intermolecular H-bonds, is researched with the AFM method.

Dual-Function, Light Switchable Cobalt Catalysis via Active Site Metamorphosis

2019 ◽  
Author(s):  
Enrico Bergamaschi ◽  
Frédéric Beltran ◽  
Christopher Teskey
Keyword(s):  
Visible Light ◽  
Active Site ◽  
Catalytic Site ◽  
Dual Function ◽  
Catalytic Systems ◽  
Hydride Complex ◽  
Dual Functional ◽  
Multiple Processes ◽  
Olefin Migration

<p></p><p></p><p>Switchable catalysis offers opportunities to control the rate or selectivity of a reaction <i>via</i> a stimulus such as pH or light. However, few examples of switchable catalytic systems that can facilitate multiple processes exist. Here we report a rare example of such dual-functional, switchable catalysis. Featuring an easily prepared, bench-stable cobalt(I) hydride complex in conjunction with pinacolborane, we can completely alter the reaction outcome between two widely employed transformations – olefin migration and hydroboration – with visible light as the sole trigger. This dichotomy arises from ligand photodissociation which leads to metamorphosis of the active catalytic site, resulting in divergent mechanistic pathways.</p><p></p><p></p>

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