Heterogeneous asymmetric reactions: Part 40. New data on repeated use of Pt-alumina catalyst during enantioselective hydrogenation of ethyl pyruvate
作者： Katalin Balázsik , Mihály Bartók
DOI: 10.1016/J.MOLCATA.2004.05.011
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摘要: Abstract The repeated use of Pt-alumina (E4759) catalyst modified by dihydrocinchonidine (DHCD) was studied in the enantioselective hydrogenation ethyl pyruvate under mild experimental conditions not before (hydrogen pressure: 1 bar, temperature: 253–298 K, DHCD concentration: 0.001–0.1 mmol/l) toluene and AcOH. effects different reuse methods, concentration temperature on conversion enantiomeric excess were studied. In depending reaction an “increase ee reuse” 10–20% observed. This effect found AcOH medium. our opinion, phenomenon is intrinsic feature Pt-alumina-cinchona system, which restructuring Pt surface may play important role.
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