Metathesis of Electron-Rich Olefins: Structure and Reactivity of Electron-Rich Carbene Complexes
作者:Janis Louie、Robert H. Grubbs
DOI:10.1021/om011037a
日期:2002.5.1
ruthenium carbene complexes, (PCy3)2Cl2RuC(H)ER (ER = OEt (5), SEt (6), SPh (7), N(carbazole) (8), N(pyrrolidinone) (9)) in yields ranging from 66 to 90%. Such complexes containing an electron-donating group on the carbene carbon are often referred to as Fischer-type carbenes. Replacement of one phosphine ligand with 1,3-dimesitylimidazolylidene (IMes) afforded the respective mixed-ligand complexes (IMes)(PCy3)Cl2RuC(H)ER
向(PCy 3)2 Cl 2 Ru C(H)R(1a,b)中添加过量的H 2 C C(H)ER可提供一系列定义明确的钌卡宾络合物(PCy 3)2 Cl 2 Ru C(H)ER(ER = OEt(5),SEt(6),SPh(7),N(咔唑)(8),N(吡咯烷酮)(9))的收率介于66%至90%之间。这种在卡宾碳上包含给电子基团的络合物通常被称为费歇尔型卡宾。与1,3- dimesitylimidazolylidene(IMES)一种膦配体的置换,得到混合各配体配合物(IMES)(PCY 3)氯2孺C(H)ER(11 - 14在48-89%收率)。或者,将H 2 C C(H)OEt加至(H 2 IMes)(PCy 3)Cl 2 Ru C(H)Ph(3a; H 2 IMes = 1,3-dimesityl-4,5-dihydroimidazolylidelyne) (H 2 IMes)(PCy 3)Cl