A Highly Active Heterogeneous Palladium Catalyst for the Suzuki-Miyaura and Ullmann Coupling Reactions of Aryl Chlorides in Aqueous Media

2010 ◽  
Vol 122 (24) ◽  
pp. 4148-4152 ◽  
Author(s):  
Bizhen Yuan ◽  
Yingyi Pan ◽  
Yingwei Li ◽  
Biaolin Yin ◽  
Huanfeng Jiang
Keyword(s):  
Palladium Catalyst ◽  
Aqueous Media ◽  
Coupling Reactions ◽  
Aryl Chlorides ◽  
Highly Active ◽  
Heterogeneous Palladium Catalyst ◽  
Ullmann Coupling

Pyridinyl functionalized MCM-48 supported highly active heterogeneous palladium catalyst for cross-coupling reactions

RSC Advances ◽  
2015 ◽  
Vol 5 (25) ◽  
pp. 19630-19637 ◽  
Author(s):  
Shaheen M. Sarkar ◽  
Md. Lutfor Rahman ◽  
Mashitah Mohd Yusoff
Keyword(s):  
Palladium Catalyst ◽  
Cross Coupling ◽  
Significant Loss ◽  
Pd Catalyst ◽  
Coupling Reactions ◽  
Cross Coupling Reactions ◽  
Highly Active ◽  
Supported Pd ◽  
Heterogeneous Palladium Catalyst

Pyridinyl functionalized MCM-48-supported Pd-catalyst efficiently (0.013–0.025 mol%) promoted Heck, Suzuki and Sonogashira cross-coupling reactions. Moreover, the catalyst was reused five times without significant loss of its activity.

Pd (II) Immobilized on Clinoptilolite as a Highly Active Heterogeneous Catalyst for Ullmann Coupling-type S-arylation of Thiols with Aryl Halides

2020 ◽  
Vol 23 (7) ◽  
pp. 658-666 ◽  
Author(s):  
Abdollah Alizadeh ◽  
Mohammad A. Khalilzadeh ◽  
Eskandar Alipour ◽  
Daryoush Zareyee
Keyword(s):  
Heterogeneous Catalyst ◽  
Palladium Catalyst ◽  
Large Scale ◽  
Reaction Times ◽  
Toxic Waste ◽  
Pd Catalyst ◽  
Highly Active ◽  
Coupling Type ◽  
Heterogeneous Palladium Catalyst ◽  
Ullmann Coupling

Background: There are a number of protocols for Ullmann coupling–type S-arylation reactions, many of them suffer from the use of homogenous and often corrosive catalyst, cumbersome workup procedures, and long reaction times. Besides, many of these reagents are expensive and non-recoverable, leading to the generation of a large amount of toxic waste particularly when large-scale applications are considered. Objective: The aim of this study was to prepare a new Pd catalyst bonded on the surface of zeolite as a heterogeneous catalyst. Methods: A heterogeneous palladium catalyst has been prepared by immobilizing Pd ions on Clinoptilolite. This novel developed heterogeneous catalyst was thoroughly examined for Ullmann coupling–type S-arylation reaction using different bases, solvents and 0.003 mg of the catalyst. The structural and morphological characterizations of the catalyst were carried out using XRD, TGA, BET and TEM techniques. Results: Highly efficient heterogeneous palladium catalyst has been developed by immobilizing Pd ions on Clinoptilolite, as one of the most abundant naturally occurring zeolites for Ullmann Sarylation. By using this method, we provide an efficient way to a wide variety of substituted thiolic compounds. Moreover, the catalyst is easily recovered using simple filtration and reused for 5 consecutive runs. Conclusion: In this effort, we developed a new Pd catalyst bonded on the surface of zeolite as a substrate to prepare the heterogeneous catalyst. We demonstrate that this novel catalyst offers reliable and convincing data that may offer a valuable application in further developing the science and technology of Ullmann reaction protocols and allied industries. Additionally, the catalyst was reusable and kept its high activities over a number of cycles.

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