Hollow Zeolitic Imidazolate Framework Nanospheres as Highly Efficient Cooperative Catalysts for [3+3] Cycloaddition Reactions,Journal of the American Chemical Society

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Hollow Zeolitic Imidazolate Framework Nanospheres as Highly Efficient Cooperative Catalysts for [3+3] Cycloaddition Reactions
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2014-09-30 , DOI: 10.1021/ja506372z
Fang Zhang _{1,

2} , Yongyi Wei _{1,

2} , Xiaotao Wu ₁ , Huangyong Jiang ₁ , Wei Wang ₂ , Hexing Li ₁

Affiliation

Herein we describe a novel, hollow-structured zeolitic imidazolate framework (ZIF-8-H) nanosphere as a highly efficient catalyst for [3+3] cycloaddition reactions. The programmed installation of acidic Zn(2+) species and basic imidazolate moieties creates a synergistic catalytic system. Appropriate positioning of these functionalities in the catalytic system makes it possible to bring two substrates into close proximity and activate them cooperatively. Moreover, the flexible shell and the surface mesopores of ZIF-8-H provide the capacity for favorable binding of various sized substrates, stabilizing intermediates via their multiple force networks and the increased accessibility of the active sites. These features render ZIF-8-H a more highly active promoter than its homogeneous precursors, bulk ZIF-8 and ZIF-8-N nanoparticles. Finally, the robust catalyst can be easily recovered and reused 10 times without loss of catalytic activity.

中文翻译：

空心沸石咪唑酯骨架纳米球作为 [3+3] 环加成反应的高效协同催化剂

在此，我们描述了一种新型中空结构沸石咪唑酯骨架 (ZIF-8-H) 纳米球，作为 [3+3] 环加成反应的高效催化剂。酸性 Zn(2+) 物种和碱性咪唑酯部分的程序化安装创建了一个协同催化系统。这些功能在催化系统中的适当定位可以使两个底物靠近并协同激活它们。此外，ZIF-8-H 的柔性外壳和表面中孔提供了有利结合各种尺寸底物的能力，通过其多力网络稳定中间体，并增加了活性位点的可及性。这些特征使 ZIF-8-H 成为比其均质前体、块状 ZIF-8 和 ZIF-8-N 纳米颗粒更高活性的促进剂。最后，

更新日期：2014-09-30

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