文献类型：期刊文献

英文题名：An easy and effective approach towards heterogeneous Pt/SiO 2-cinchonidine catalyst system for enantioselective hydrogenation of ethyl pyruvate

作者：Azmat, Muhammad Usman[1]; Guo, Yong[1]; Guo, Yun[1]; Wang, Yanqin[1]; Lu, Guanzhong[1]

机构：[1] Key Lab for Advanced Materials, Research Institute of Industrial Catalysis, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China

年份：2011

卷号：336

期号：1-2

起止页码：42

外文期刊名：Journal of Molecular Catalysis A: Chemical

收录：EI(收录号：20110813678746)

语种：英文

外文关键词：Enantiomers - Hydrogenation - Carboxylation - Catalysts

摘要：A single unit catalyst system (Pt/silica-chiral modifier) is developed for the enantioselective hydrogenation of ethyl pyruvate. Cinchonidine was tethered directly without prior modification over carboxylate functionalized SBA-15 by the reaction of vinyl group in cinchonidine with -COOH group in functionalized SBA-15 through ester linkage. Then Pt nanoparticles were deposited over cinchonidine tethered SBA-15. The mesostructures were characterized by small-angle XRD, N2 sorption and TEM, while the surface functionalization was confirmed by FTIR, TG/DTA and solid state 13C NMR. Enantioselectivity of the catalyst system for hydrogenation of ethyl pyruvate was determined by GC/FID. The highest enantiomeric excess was achieved as 70.8% and the catalyst recyclability was authenticated even after 3rd reuse without significant loss in enantiomeric excess. ? 2010 Elsevier B.V.