木虫 (职业作家)
欲将心事付瑶琴······ ![]()
|
★ ★ ★ ★ rabbit7708(金币+4):谢谢应助,你可以用WINRAR分卷压缩的。呵,现在论坛也支持1M的附件了,所以只管发吧!:)
在Pd/C催化剂里掺杂一些硫化物来降低它的活性
实现选择性的还原也是很热的一个课题
如Lindlar Pd 就是在Pd/C催化剂里掺杂喹啉类含氮原子的化合物
实现了炔键的选择性还原
下面的这一篇文章是在Pd/C催化剂里掺杂二苯基硫醚Ph2S
选择行非常高
羰基,醛基等均不受影响
Chemoselective hydrogenation method catalyzed by Pd C using diphenylsulfide as a reasonable catalyst poison
Tetrahedron, Vol 62, (2006), page 11925–11932
Akinori Mori, Tomoteru Mizusaki, Yumi Miyakawa, Eri Ohashi, Tomoko Haga,
Tomohiro Maegawa, Yasunari Monguchi and Hironao Sajiki*
Abstract—While Pd/C is one of the most useful catalysts for hydrogenation, the high catalyst activity of Pd/C causes difficulty in its application
to chemoselective hydrogenation between different types of reducible functionalities. In order to achieve chemoselective hydrogenation
using Pd/C, we investigated catalyst poison as a controller of the catalyst activity.We found that the addition of Ph2S (diphenylsulfide) to
the Pd/C-catalyzed hydrogenation reaction mixture led to reasonable deactivation of Pd/C. By the use of the Pd/C–Ph2S catalytic system,
olefins, acetylenes, and azides can be selectively reduced in the coexistence of aromatic carbonyls, aromatic halides, cyano groups, benzyl
esters, and N-Cbz (benzyloxycarbonyl) protecting groups. The present method is promising as a general and practical chemoselective hydrogenation
process in synthetic organic chemistry.
真是不好意思,本想把这篇文献给传上去的
但1.12Mb,附件有点大
我又不会压缩成512Kb的方法
有需要这篇文献的虫子尽管给我留言
看到你的留言的话我会第一时间给你发过去的
[from berlin]我帮你传上去,但是你也要学一学怎么传啊,是不?用winrar就可以,不难的
[ Last edited by berlin on 2006-12-18 at 08:43 ] |
|