Selective [1,4]-Hydrovinylation of 1,3-Dienes with Unactivated Olefins Enabled by Iron Diimine Catalysts
作者:Valerie A. Schmidt、C. Rose Kennedy、Máté J. Bezdek、Paul J. Chirik
DOI:10.1021/jacs.8b00245
日期:2018.3.7
into the origin of the high selectivity. An iron diene complex was identified as the catalyst resting state, and one such isoprene complex, (iPrDI)Fe(η4-C5H8), was isolated and characterized. A combination of single crystal X-ray diffraction, Mößbauer spectroscopy, magnetic measurements, and DFT calculations established that the complex is best described as a high-spin Fe(I) center ( SFe = 3/2) engaged
描述了由 α-二亚胺铁配合物催化的共轭二烯与未活化 α-烯烃的选择性分子间 [1,4]-加氢乙烯基化。以独特的[1,4]-选择性获得了具有附加值的“跳过”二烯产物,并且观察到支化的(Z)-烯烃产物的形成而没有烯烃异构化的证据。使用明确定义的单组分铁预催化剂 (MesDI)Fe(COD) (MesDI = [2,4,6-Me3-C6H2-N=CMe]2) 进行的机理研究;COD = 1,5-环辛二烯)提供了对高选择性起源的见解。铁二烯配合物被确定为催化剂静止状态,并且分离和表征了一种这样的异戊二烯配合物,(iPrDI)Fe(η4-C5H8)。单晶 X 射线衍射、穆斯鲍尔光谱、磁性测量的组合,和 DFT 计算确定,该复合物最好被描述为高自旋 Fe(I) 中心 (SFe = 3/2),与 α-二亚胺自由基阴离子 (SDI = -1/2) 进行反铁磁耦合,从而产生观察到的 S = 1 基态。催化反