Study of “ligand-free” catalytic systems with low palladium content for the Heck reaction

Смирнов, В. В.; Halaiqa, A. Al; Shmidt, A. F.

doi:10.1134/s1070427210030158

Cited by 2 publications

(1 citation statement)

References 27 publications

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“…Furthermore, our assumption that the application of BnEt 2 N would have a beneficial effect on the conversion via the formation of BnEt 2 NHBr, a quaternary ammonium salt, was not justified by experimental results. Heck reaction in the presence of quaternary ammonium salts as additives Quaternary ammonium salts usually have a beneficial effect on the Heck reaction in the presence of inorganic bases [43,44]. They can be applied as phase transfer catalysts, and also as stabilizing agents, which ensure the formation of Pd(0) species in the reductive elimination step (Fig.…”

Section: Resultsmentioning

confidence: 99%

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

Kunfi

Mastalir

Bucsi

et al. 2016

Reac Kinet Mech Cat

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Supported Pd catalysts were investigated in the Heck coupling reactions: Pd/C; Pd/BaSO 4 ; 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 Na 2 CO 3 as a base and Bu 4 NCl 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.

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Section: Resultsmentioning

confidence: 99%