scholarly journals Nanographene Sheet Immobilized Transition Metal Complexes for C-C Coupling Reactions

2018 ◽  
Vol 7 (4.5) ◽  
pp. 431
Author(s):  
Saroja Anuma ◽  
Badekai Ramachandra Bhat
Keyword(s):  
Schiff Base ◽  
Transition Metal ◽  
Metal Complexes ◽  
Graphene Sheet ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Schiff Base Complexes ◽  
Environmentally Benign ◽  
Coupling Reactions ◽  
Cross Coupling Reaction

Transition metal Schiff base complexes covalently immobilized on the surface of amino functionalized graphene sheet to catalyze C-C coupling reaction is reported. Graphene sheet which synthesized using mechanical exfoliation and then by differential oxidative reduction phenomenon of graphite. The schiff base ligand is prepared using aldehyde and amino groups containing compounds which further treated with metal salts to form metal complexes. The as-synthesized metal complexes was then incorporated into amino functionalized nanosheets which are characterized using different spectrochemical techniques. The catalytic investigation of the as-prepared catalyst were done by the cross coupling of aryl halides and aryl boronic acids to form biaryls as product in C-C cross coupling reaction. The yield of the products were high and selective which were analyzed using Gas chromatography technique. The advantage of this catalyst is high stability, recyclability easy recovery of catalyst, environmentally benign and mild reaction condition.  

scholarly journals Chemoselective nickel-catalyzed coupling through substrate photoexcitation

2021 ◽  
Author(s):  
Pradipta Das ◽  
Eliot Woods ◽  
Jack Ly ◽  
Jack Olding ◽  
Kayla Presley ◽  
...  
Keyword(s):  
Excited State ◽  
Transition Metal ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Ni Catalyst ◽  
Coupling Reactions ◽  
Cross Coupling Reactions ◽  
Cross Coupling Reaction ◽  
Metal Catalyzed ◽  
Coupling Mechanisms

Metallaphotoredox catalysis combines the well-established mechanisms of transition-metal-catalyzed cross-coupling reactions with one-electron redox manipulations enabled by light. In most cases, a transition metal or organic dye serves as the photoredox catalyst while a ground-state Pd or Ni catalyst performs the organometallic steps. Cross-coupling mechanisms that rely on direct photoexcitation of a light-absorbing substrate have the potential to access distinct mechanisms and deliver unique selectivity based on the substrate’s excited-state properties. In this report, we describe a photoinduced, Ni-catalyzed Suzuki–Miyaura cross coupling reaction that selectively functionalizes BODIPY chromophores, a versatile class of tunable, bright, photostable fluorophores. Using a bis-iodo BODIPY substrate, the selectivity for mono- vs. bis-arylation was found to be governed by a remote substituent that subtly alters the excited-state properties of the substrate. Consistent with a substrate photoexcitation mechanism, high chemoselectivity is also observed in mixtures of chromophores with distinct excited-state properties. This reaction is compatible with a variety of substituted BODIPY chromophores and boronic acids and esters, enabling the rapid synthesis of unsymmetrically-substituted chromophores.

An Iron-Based Catalyst Enables The Enantioconvergent Synthesis of Chiral 1,1-Diarylalkanes Through a Suzuki-Miyaura Cross-Coupling Reaction

2020 ◽  
Author(s):  
Chet Tyrol ◽  
Nang Yone ◽  
Connor Gallin ◽  
Jeffery Byers
Keyword(s):  
Coupling Reaction ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Radical Intermediates ◽  
Cross Coupling Reactions ◽  
Cross Coupling Reaction ◽  
Boronic Esters ◽  
Carbon Centered Radical ◽  
Iron Based ◽  
High Yields

By using an iron-based catalyst, access to enantioenriched 1,1-diarylakanes was enabled through an enantioselective Suzuki-Miyaura crosscoupling reaction. The combination of a chiral cyanobis(oxazoline) ligand framework and 1,3,5-trimethoxybenzene additive were essential to afford high yields and enantioselectivities in cross-coupling reactions between unactivated aryl boronic esters and a variety of benzylic chlorides, including challenging ortho-substituted benzylic chloride substrates. Mechanistic investigations implicate a stereoconvergent pathway involving carbon-centered radical intermediates.

Room-Temperature, Water-Promoted, Radical-Coupling Reactions of Phenols with tert-Butyl Nitrite

Synlett ◽  
2017 ◽  
Vol 28 (16) ◽  
pp. 2153-2156 ◽  
Author(s):  
Wen-Ting Wei ◽  
Hongze Liang ◽  
Wen-Ming Zhu ◽  
Weida Liang ◽  
Yi Wu ◽  
...  
Keyword(s):  
Room Temperature ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Coupling Reactions ◽  
Phenol Derivative ◽  
Tert Butyl ◽  
Radical Coupling ◽  
Air Atmosphere ◽  
Cross Coupling Reaction ◽  
Temperature Water

A radical–radical cross-coupling reaction of phenols with tert-butyl nitrite has been developed with the use of water as an additive. This method allows the construction of C–N bonds under an air atmosphere at room temperature, providing the ortho-nitrated phenol derivative in moderate to good yields.

scholarly journals A phosphine-free, atom-efficient cross-coupling reaction of triorganoindiums with acyl chlorides catalyzed by immobilization of palladium(0) in MCM-41

RSC Advances ◽  
2017 ◽  
Vol 7 (67) ◽  
pp. 42570-42578 ◽  
Author(s):  
Jiankang Miao ◽  
Bin Huang ◽  
Haiyi Liu ◽  
Mingzhong Cai
Keyword(s):  
Schiff Base ◽  
Schiff Base Complex ◽  
Coupling Reaction ◽  
Cross Coupling ◽  
Free Atom ◽  
Acyl Chlorides ◽  
Base Complex ◽  
Cross Coupling Reaction ◽  
Mcm 41

The phosphine-free, atom-efficient cross-coupling of triorganoindiums with acyl chlorides has been achieved using a recyclable MCM-41-immobilized palladium(0)–Schiff base complex.

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