Issue 35, 2012
From the journal:

Dalton Transactions

Axially coordinated chiral salen Mn(iii) anchored onto azole onium modified ZnPS-PVPA as effective catalysts for asymmetric epoxidation of unfunctionalized olefins†

Jing Huang,a   Xiangkai Fu,*a   Gang Wang,a   Qiang Miaoa  and  Guomin Wanga  

* Corresponding authors

a College of Chemistry and Chemical Engineering Southwest University, Research Institute of Applied Chemistry Southwest University, The Key Laboratory of Applied Chemistry of Chongqing Municipality, The Key Laboratory of Eco-environments in Three Gorges Reservoir Region Ministry of Education, Chongqing 400715, China
E-mail: hj41012@163.com
Fax: +86 2368254000
Tel: +86 2368253704

Abstract

A series of chiral salen Mn(III) immobilized onto azole onium modified zinc poly(styrene-phenylvinyl phosphonate)-phosphate (ZnPS-PVPA) were prepared. The catalysts were characterized by FT-IR, diffusion reflection UV-vis, AAS, N2 volumetric adsorption, SEM, TEM, XPS, XRD, TG and elemental analysis. The results showed that the chiral salen Mn(III) complex was successfully immobilized onto ZnPS-PVPA. These prepared catalysts were evaluated in the asymmetric epoxidation of unfunctionalized olefins with m-CPBA and NaIO4 as oxidants and demonstrated higher catalytic activities than those of the corresponding homogeneous chiral salen Mn(III) catalyst under the same conditions. Moreover, these heterogeneous catalysts were stable and could be recycled nine times without significant loss of activity. Furthermore, this novel type of catalyst could also be validly used in large-scale reactions with superior catalytic disposition being maintained at the same level, which indicated the potential for applications in industry.

Graphical abstract: Axially coordinated chiral salen Mn(iii) anchored onto azole onium modified ZnPS-PVPA as effective catalysts for asymmetric epoxidation of unfunctionalized olefins

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Article information

DOI
https://doi.org/10.1039/C2DT30081H
Article type
Paper
Submitted
12 Jan 2012
Accepted
17 Jun 2012
First published
19 Jun 2012

Dalton Trans., 2012,41, 10661-10669

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Axially coordinated chiral salen Mn(III) anchored onto azole onium modified ZnPS-PVPA as effective catalysts for asymmetric epoxidation of unfunctionalized olefins

J. Huang, X. Fu, G. Wang, Q. Miao and G. Wang, Dalton Trans., 2012, 41, 10661 DOI: 10.1039/C2DT30081H

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