Heck arylation of alkenes with aryl bromides by using supported Pd catalysts: a comparative study

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• 作者：Attila Kunfi ; Ágnes Mastalir ; Imre Bucsi…
• 关键词：Palladium on activated carbon ; Palladium on barium sulfate ; Pd EnCat ; Tetrabutyl ammonium salts ; Leaching
• 刊名：Reaction Kinetics, Mechanisms and Catalysis
• 出版年：2016
• 出版时间：October 2016
• 年：2016
• 卷：119
• 期：1
• 页码：165-178
• 全文大小：573 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Industrial Chemistry and Chemical Engineering
  Physical Chemistry
  
• 出版者：Akad茅miai Kiad贸, co-published with Springer Science+Business Media B.V., Formerly Kluwer Academic
• ISSN：1878-5204
• 卷排序：119

文摘

Supported Pd catalysts were investigated in the Heck coupling reactions: Pd/C; Pd/BaSO₄; Pd EnCat. We optimized the experimental conditions of the Heck reaction of bromobenzene and styrene by using various bases in the presence of quaternary ammonium salts. It was found that the examined catalysts work as a reservoir of the catalytically active Pd species during the reaction. However, they have a different activity and recyclability under the investigated reaction conditions. Pd EnCat displayed the highest activity and selectivity in NMP with Na₂CO₃ as a base and Bu₄NCl as an additive. By using this catalytic system, the reactions of para-substituted aryl halides with styrene and methyl methacrylate afforded excellent conversions and selectivities.