| 查看: 194 | 回复: 2 | |||
| 当前主题已经存档。 | |||
| 【悬赏金币】回答本帖问题，作者rocket18将赠送您 5 个金币 | |||
[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. |
回复此楼» 猜你喜欢
实验室接单子
已经有7人回复
-
假如你的研究生提出不合理要求
已经有11人回复
-
全日制（定向）博士
已经有5人回复
-
萌生出自己或许不适合搞科研的想法，现在跑or等等看？
已经有4人回复
-
Materials Today Chemistry审稿周期
已经有4人回复
-
参与限项
已经有3人回复
-
对氯苯硼酸纯化
已经有3人回复
-
求助:我三月中下旬出站，青基依托单位怎么办？
已经有12人回复
-
所感
已经有4人回复
-
要不要辞职读博？
已经有7人回复
脂质体
至尊木虫 (知名作家)
- 应助: 205 (大学生)
- 金币: 37210.8
- 红花: 48
- 帖子: 5953
- 在线: 892.3小时
- 虫号: 102799
- 注册: 2005-11-14
- 专业: 药剂学
2楼2008-04-19 09:42:27
3楼2008-04-19 13:36:59