intermolecular aza‐Wacker‐type reaction was developed. When a readily available olefin was treated with a nitrogen nucleophile in the presence of a Pd‐SPRIX complex and potassium persulfate, allylaminederivatives were obtained with high yield and excellent regioselectivity. The mechanistic studies showed that the reaction followed first‐order dependence on the olefin as well as palladium catalyst, but
Silica-Supported Dendrimer-Palladium Complex-Catalyzed Selective Hydrogenation of Dienes to Monoolefins
作者:Pumza P. Zweni、Howard Alper
DOI:10.1002/adsc.200505236
日期:2006.4
The selective hydrogenation of cyclic and acyclicdienes to monoolefins occurs under very mild conditions, in the presence of silica-supported PAMAM-Pd complexes. The activity and selectivity of this reaction is sensitive to the dendrimer structure. These dendritic complexes display excellent recycle properties, retaining activity for up to eight recycles.
of two different internal alkene isomers. The chromium catalyst, in the presence of HBpin/LiOtBu, enables the isomerization of alkenes over multiple carbon atoms to give the most thermodynamically stable isomers. The same catalyst allows for the selective isomerization of terminal alkenes over one carbon atom without an additive, exhibiting efficient and controllable alkene transposition selectivity
我们报告了一种单一的添加剂响应型铬催化系统,用于选择性生产两种不同的内部烯烃异构体中的任何一种。在 HBpin/LiO t Bu 存在下,铬催化剂能够使烯烃在多个碳原子上异构化,得到热力学最稳定的异构体。同一催化剂无需添加剂即可实现末端烯烃在一个碳原子上的选择性异构化,表现出高效且可控的烯烃转位选择性。
Lithium aluminum hydride reduction of allylic substrates. Notable leaving group effects on the product regiochemistry