A Catalytic Application of Co/Zr Heterobimetallic Complexes: Kumada Coupling of Unactivated Alkyl Halides with Alkyl Grignard Reagents
作者:Wen Zhou、Jonathan Wesley Napoline、Christine M. Thomas
DOI:10.1002/ejic.201100109
日期:2011.5
Tris(phosphanylamide) early/late heterobimetallic Zr/Co complexes, ClZr(R′NPR2)3CoI [R′ = iPr, R = Ph (1), R′ = 2,4,6-trimethylphenyl, R = iPr (2), R′ = R = iPr (3)], have been utilized as catalysts for the cross-coupling of alkyl halides with n-octylmagnesium bromide. While yields are consistently higher for alkyl bromide substrates, it is found that these unusual heterobimetallic complexes are also active
三(磷酰胺)早期/晚期异双金属 Zr/Co 配合物,ClZr(R'NPR2)3CoI [R' = iPr,R = Ph (1),R' = 2,4,6-三甲基苯基,R = iPr (2) , R' = R = iPr (3)],已被用作烷基卤化物与正辛基溴化镁交叉偶联的催化剂。虽然烷基溴底物的产率始终较高,但发现这些不寻常的异双金属配合物对更具挑战性的烷基氯底物也有活性。鉴于单金属钴配合物对这些底物呈惰性这一事实特别有趣,这表明 Zr 在催化中也发挥作用。自由基捕获研究表明单电子转移自由基氧化加成途径是有效的。