| Preparation of MCM-41-supported chiral Salen Mn （Ⅲ） catalysts and their catalytic properties in the asymmetric epoxidation of olefins |
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| 引用本文： | ZHAO DongMin ZHAO JiQuant ZHAO ShanShan HE LeQin WANG WeiYu. Preparation of MCM-41-supported chiral Salen Mn （Ⅲ） catalysts and their catalytic properties in the asymmetric epoxidation of olefins[J]. 科学通报(英文版), 2007, 52(17): 2337-2344. DOI: 10.1007/s11434-007-0333-7 |
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| 作者姓名： | ZHAO DongMin ZHAO JiQuant ZHAO ShanShan HE LeQin WANG WeiYu |
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| 作者单位： | School of Chemical Engineering, Hebei University of Technology, Tianjin 300130, China |
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| 基金项目： | Supported by the National Natural Science Foundation of China （Grant No. 20376017） |
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| 摘 要： | A secondary amino-modified mesoporous molecular sieve MCM-41 was obtained by reaction of bis(3-(triethoxysilyl)propyl)amine with MCM-41. The chiral Salen-Mn (III) complex was anchored onto the modified MCM-41 by a multi-step grafting method and two heterogenized catalysts with different Mn contents were obtained. The catalysts were characterized by XRD, N2 adsorption, ICP, FT-IR and DR UV-Vis. Their catalysis on asymmetric epoxidation of several olefins was studied with NaClO and m-CPBA as oxidants respectively. It was found that both the activity and enantioselectivity of the cata- lysts decreased after the homogeneous catalyst was heterogenized. The reasons resulting in the de- crease of catalytic performance were discussed.
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| 关 键 词： | MCM-41 heterogenization α -methylstyrene Salen Mn (III) asymmetric epoxidation 1 2-dihydronaphthalene |
| 收稿时间： | 2006-10-23 |
| 修稿时间： | 2006-12-23 |
Preparation of MCM-41-supported chiral Salen Mn (III) catalysts and their catalytic properties in the asymmetric epoxidation of olefins |
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| Zhao DongMin,Zhao JiQuan,Zhao ShanShan,He LeQin,Wang WeiYu. Preparation of MCM-41-supported chiral Salen Mn (III) catalysts and their catalytic properties in the asymmetric epoxidation of olefins[J]. Chinese science bulletin, 2007, 52(17): 2337-2344. DOI: 10.1007/s11434-007-0333-7 |
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| Authors: | Zhao DongMin Zhao JiQuan Zhao ShanShan He LeQin Wang WeiYu |
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| Affiliation: | (1) School of Chemical Engineering, Hebei University of Technology, Tianjin, 300130, China |
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| Abstract: | A secondary amino-modified mesoporous molecular sieve MCM-41 was obtained by reaction of bis(3-(triethoxysilyl)propyl)amine with MCM-41. The chiral Salen-Mn (III) complex was anchored onto the modified MCM-41 by a multi-step grafting method and two heterogenized catalysts with different Mn contents were obtained. The catalysts were characterized by XRD, N2 adsorption, ICP, FT-IR and DR UV-Vis. Their catalysis on asymmetric epoxidation of several olefins was studied with NaClO and m-CPBA as oxidants respectively. It was found that both the activity and enantioselectivity of the cata- lysts decreased after the homogeneous catalyst was heterogenized. The reasons resulting in the de- crease of catalytic performance were discussed. |
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| Keywords: | MCM-41 heterogenization α -methylstyrene Salen Mn (III) asymmetric epoxidation 1,2-dihydronaphthalene |
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