Facile Pd(II)- and Ni(II)-Catalyzed Isomerization of Terminal Alkenes into 2-Alkenes
作者:Hwan Jung Lim、Craig R. Smith、T. V. RajanBabu
DOI:10.1021/jo900180p
日期:2009.6.19
of [(allyl)PdCl]2 or [(allyl)NiBr]2, a triarylphosphine, and silver triflate at room temperature. The isomeric ratio (E:Z) depends on the alkenes, the E-isomer being the major one. The reaction is tolerant to a wide variety of functional groups including other reactive olefins. Unlike the more reactive Ir catalysts, monosubstituted alkenes give almost exclusively the 2-alkenes. Direct comparison to two
通过用催化量的 [(烯丙基)PdCl] 2或 [(烯丙基)NiBr] 处理单取代和 2,2'-二取代末端烯烃,可以将其异构化为更稳定的内 ( Z )- 和 ( E )-烯烃2 、室温下的三芳基膦和三氟甲磺酸银。异构体比例 ( E : Z ) 取决于烯烃,其中E异构体是主要异构体。该反应可耐受多种官能团,包括其他反应性烯烃。与活性更高的 Ir 催化剂不同,单取代烯烃几乎只生成 2-烯烃。还描述了与该过程中两种最著名的催化剂[Ir(PCy 3 ) 3 ] + [BPh 4 ] -和格拉布第二代复分解催化剂}的直接比较。