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Cu/chiral phosphoric acid-catalyzed radical-initiated asymmetric aminosilylation of alkene with hydrosilane

Science China Chemistry 2019年第11期62卷 1529-1536页

作者： Yang Zeng Xiao-Dong Liu Xian-Qi Guo Qiang-Shuai Gu Zhong-Liang Li Xiao-Yong Chang Xin-Yuan Liu Shenzhen Grubbs Institute Southern University of Science and TechnologyShenzhen 518055China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China Department of Chemistry Southern University of Science and TechnologyShenzhen 518055Chin

The catalytic radical-initiated asymmetric 1,2-aminosilylation of alkene with a hydrosilane under Cu(I)/CPA cooperative catalysis has been *** method features the use of hydrosilane as the reductive radical precursor,enabling efficient access to skeletally diverse silicon-containing azaheterocycles including pyrrolidine,indoline and isoindoline bearing anα-tertiary stereocenter with high *** key to the success includes the use of Cu(I)/CPA cooperative catalyst system and theβ-silicon effect of the silyl group to stabilize the in situ generated carbocation intermediate.

关键词： asymmetric radical chemistry aminosilylation alkenes Cu/chiral phosphoric acid silyl radical

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Preparation and Characterization of Divanadium Pentoxide Nanowires inside SBA-15 Channels

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Chinese Journal of Chemistry 2004年第1期22卷 33-37页

作者：朱卡克岳斌谢颂海张嗣轶张飚金松林贺鹤勇 Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Department of ChemistryFudan University

One-dimensional V2O5 nanowires have been synthesized inside the channels of mesoporous silica SBA-15 through chemical approach, which involves aminosilylation of silanol groups on the silica surface, anchoring of isopoly acid, H6V10O28, by neutralization of basic amine groups, and thermal decomposition. The formation and physicochemical properties of the nanowires were monitored and studied by TG-DTA, variable temperature in situ XRD, TEM, N2 sorption measurements and UV-Vis DRS. The results indicate that V2O5 nanowires formed within SBA-15 channels belong to orthorhombic polycrystal domains. The oxygen-to-metal charge transfer band of V2O5 nanowires shows a blue shift in comparison with bulk V2O5, which clearly exhibits the quantum size effect of nanowires.

关键词： nanowire mesoporous SBA-15 aminosilylation polyoxometallate thermal decomposition

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Catalytic Aerobic Oxidation of Acetaldehyde over Keggin-type Molybdovanadophosphoric Acid/SBA-15 under Ambient Condition

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Chinese Journal of Chemistry 2006年第8期24卷 1001-1005页

作者：周琰岳斌包任烈刘世熙贺鹤勇 Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai 200433 China

Keggin-type molybdovanadophosphoric acids （HPA）, H4PMo11VO40 （1）, H5PMo10V2O40 （2） and H6PMo9V3O40 （3） were anchored onto γ-aminopropyltriethoxysilane （APTS） aminosilylated silica mesoporous SBA-15 through acid-base neutralization and the resulting HPA/APTS/SBA-15 were characterized by BET, TEM, XRD, ICP, FFIR and ^31p MAS NMR. The characterization results indicate that the Keggin-structure of these HPAs is preserved within the mesoporous silica host. The samples were tested for catalytic aerobic oxidation of acetaldehyde heterogeneously in liquid phase under ambient condition. The electrostatic force between heteropoly acid and amino groups grafted on the silica channel surface leads to strong immobilization of HPA inside SBA-15 which is against the leaching during the reaction. The good catalytic performance and easy recycle of these catalysts make them as potential environmental friendly catalysts for elimination of indoor air pollutants.

关键词： Keggin-type molybdovanadophosphoric acid aminosilylation mesoporous SBA-15 acetaldehyde,oxidation ambient condition

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