The role of Pd nanoparticles in ionic liquid in the Heck reaction

被引：344

作者：

Cassol, CC ^{[1
]}

Umpierre, AP ^{[1
]}

Machado, G ^{[1
]}

Wolke, SI ^{[1
]}

Dupont, J ^{[1
]}

机构：

[1] Univ Fed Rio Grande do Sul, Inst Chem, Lab Mol Catalysis, BR-91501970 Porto Alegre, RS, Brazil

来源：

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2005年 / 127卷 / 10期

关键词：

D O I：

10.1021/ja0430043

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Pd(0) nanoparticles with ∼2 nm diameter, immobilized in 1-n-butyl-3-methylimidazolium hexafluorophosphate ionic liquid, are efficient catalyst precursors for coupling of aryl halides with n-butylacrylate. In situ TEM analysis of the ionic liquid catalytic solution after the catalytic reaction shows the formation of larger nanoparticles (∼6 nm). The palladium content in the organic phase during the arylation reaction was checked by ICP-AS and shows significant metal leaching (up 34%) from the ionic phase to the organic phase at low substrate conversions and drops to 5-8% leaching at higher conversions. These results strongly suggest that the Pd(0) nanoparticles serve as a reservoir of homogeneous" catalytic active species. Copyright © 2005 American Chemical Society."

引用

页码：3298 / 3299

页数：2

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