Palladium(0)-Catalyzed Cis−Trans Alkene Isomerizations

详细信息    查看全文

• 作者：Luciano Canovese ; Claudio Santo ; Fabiano Visentin
• 刊名：Organometallics
• 出版年：2008
• 出版时间：July 28, 2008
• 年：2008
• 卷：27
• 期：14
• 页码：3577-3581
• 全文大小：150K
• 年卷期：v.27,no.14(July 28, 2008)
• ISSN：1520-6041

文摘

The cis−trans isomerization of some olefins bearing strong electron-withdrawing substituents (dmma and E-tse) is catalyzed by their mere coordination to a suitable Pd(0) fragment without any external reagents. The choice of spectator ligand is fundamental to the efficiency of the process, and the phosphanyl-quinolines dppq and dppq-Me have proven to be particularly effective. The mechanism of the rearrangement is discussed, and the presence of electron-withdrawing and conjugated substituents on the olefins appears to be an essential prerequisite for the isomerization.