| MODIFICATION OF TRANSITION METAL CATIONS TO POLYMER-STABILIZED PLATINUM COLLOIDAL CLUSTERS IN ENANTIOSELECTIVE HYDROGENATION OF METHYL PYRUVATE |
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| 作者姓名： | Xiao-pingYan Bao-linHe JieZhang Han-fanLiua |
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| 作者单位： | [1]PolymerChemistryLaboratory,ChineseAcademyofSciencesandChinaPetro-ChemicalCorporation;StateKeyLaboratoryofPolymerPhysicsandPolymerChemistry,InstituteofChemistry,ChineseAcademyofSciences,Beijing100080,China [2]HubeiKeyLaboratoryforCatalysisandMaterialScience,UniversityofSouth-CentralforNationalities,Wuhan430074,China |
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| 摘 要： | Modification of transition metal cations to polymer-stabilized Pt colloidal clusters modified with cinchonidine was studied in enantioselective hydrogenation of methyl pyruvate. Compared to the enantiomeric excess (e.e.) value (71.4%) obtained without the presence of metal cations, obvious e.e. enhancement (up to 82.5%) was resulted from the addition of Zn^2 but with a certain decrease in activity. The reaction parameters in the presence of Zn^2 were also studied. It was found that the Pt colloidal catalysts in the presence of metal cations performed very differently from that in the absence of metal cations.
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| 关 键 词： | 丙酮酸甲酯 对映选择性氢化作用 过渡金属阳离子 铂 胶状束 稳定性 |
| 收稿时间： | 2004-06-24 |
| 修稿时间： | 2004-10-21 |
MODIFICATION OF TRANSITION METAL CATIONS TO POLYMER-STABILIZED PLATINUM COLLOIDAL CLUSTERS IN ENANTIOSELECTIVE HYDROGENATION OF METHYL PYRUVATE |
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| Xiao-pingYan Bao-linHe JieZhang Han-fanLiua.MODIFICATION OF TRANSITION METAL CATIONS TO POLYMER-STABILIZED PLATINUM COLLOIDAL CLUSTERS IN ENANTIOSELECTIVE HYDROGENATION OF METHYL PYRUVATE[J].Chinese Journal of Polymer Science,2005,0(4):393-399. |
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| Authors: | Xiao-ping Yan Bao-lin He Jie Zhang Han-fan Liu |
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| Institution: | Hubei Key Laboratory for Catalysis and Material Science, University of South-Central for Nationalities, Wuhan 430074, China |
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| Abstract: | Modification of transition metal cations to polymer-stabilized Pt colloidal clusters modified with cinchonidine was studied in enantioselective hydrogenation of methyl pyruvate. Compared to the enantiomeric excess (e.e.) value (71.4%)obtained without the presence of metal cations, obvious e.e. enhancement (up to 82.5%) was resulted from the addition of Zn2 but with a certain decrease in activity. The reaction parameters in the presence of Zn2 were also studied. It was found that the Pt colloidal catalysts in the presence of metal cations performed very differently from that in the absence of metal cations. |
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| Keywords: | Methyl pyruvate Colloidal platinum clusters Transition metal cations Enantioselective hydrogenation |
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