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rocket18

[求助] 帮忙翻一下摘要。。。

Continuous stable enantioselective hydrogenation of alkyl pyruvate
esters using pre-modified cinchonidine platinum catalysts

Robert L. Jenkins, Paul McMorn, and Graham J. Hutchings*
Department of Chemistry, Cardiff University, P. O. Box 912Cardiff, CF10 3TB UK
Received 15 July 2004; accepted 5 December 2004

Pre-modification of a 5 wt% Pt/c-Al2O3 catalyst with cinchonidine (0.1 g g)1 catalyst) leads to a catalyst that give stable
enantioselection when using a trickle-bed flow reactor at ambient temperature and pressure. With dichloromethane as solvent
sustained enantiomeric excess of >70% for the hydrogenation of ethyl pyruvate to (R)-ethyl lactate is observed and this is
maintained with very low cinchonidine/catalyst ratios. With dichloromethane the conversion decreases with time an effect we
consider to be due to the formation of small amounts of polymer on the catalyst surface. When ethanol is used as solvent the yield
of (R)-ethyl lactate is stable throughout the test period, although the enantiomeric excess was much lower at ca. 35%.
KEY WORDS: enantioselective hydrogenation; ethyl pyruvate hydrogenation; butadione hydrogenation; Pt/c-Al2O3 catalysts.

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脂质体

至尊木虫 (知名作家)

用修饰有辛可尼丁的铂催化剂进行丙酮酸酯的连续稳定对映立体选择性氢化
摘要:
在1克5%wtPt/γ-Al2O3催化剂上修饰0.1克辛可尼丁得到的催化剂在常温常压的滴流床反应器中具有稳定的对映立体选择性。在很低的辛可尼丁/催化剂比例下,以二氯甲烷为溶媒,丙酮酸乙酯70%以上对映立体选择性转化为了(R)-乳酸乙酯。随着时间,转化率降低,我们认为是由于在催化剂表面有少量的聚合物生成。当以乙醇为溶媒,(R)-乳酸乙酯的收率在整个试验期间是稳定的,尽管对映立体选择性低至35%。

[ Last edited by 脂质体 on 2008-4-19 at 09:43 ]
2楼2008-04-19 09:42:27
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rocket18

标题不是很通顺啊。。。
3楼2008-04-19 13:36:59
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