Catalytic C−H Bond Amination from High-Spin Iron Imido Complexes
作者:Evan R. King、Elisabeth T. Hennessy、Theodore A. Betley
DOI:10.1021/ja110066j
日期:2011.4.6
R=(t)Bu, Ad and solv=THF, OEt(2)), use of the sterically encumbered aryl-substituted ligand precluded binding of solvent and cleanly afforded a high-spin (S=2), three-coordinate complex of the type ((Ar)L)FeCl. Reaction of ((Ad)L)FeCl(OEt(2)) with alkyl azides resulted in the catalytic amination of C-H bonds or olefin aziridination at room temperature. Using a 5% catalyst loading, 12 turnovers were obtained
Direct Comparison of C–H Bond Amination Efficacy through Manipulation of Nitrogen-Valence Centered Redox: Imido versus Iminyl
作者:Matthew J. T. Wilding、Diana A. Iovan、Alexandra T. Wrobel、James T. Lukens、Samantha N. MacMillan、Kyle M. Lancaster、Theodore A. Betley
DOI:10.1021/jacs.7b08714
日期:2017.10.18
magnetometry, single crystal X-ray diffraction, XAS, and EXAFS for 6. The high-spin (S = 5/2) imidos exhibit characteristically short Fe–N bonds (3: 1.708(4) Å; 5: 1.674(11) Å), whereas the corresponding iminyls exhibit elongated Fe–N bonds (2: 1.768(2) Å; 6: 1.761(6) Å). Comparison of the pre-edge absorption feature (1s → 3d) in the X-ray absorption spectra reveals that the four imido/iminyl complexes
的还原先前报道的亚氨基自由基(氩L)的FeCl(• Ñ(C 6 H ^ 4 - p -吨丁基))(2)与氢石墨提供的相应的高自旋(小号= 5 / 2)亚氨基(氩L) Fe(N(C 6 H 4 - p - t Bu))(3)(Ar L = 5-甲磺酰基-1,9- (2,4,6-Ph 3 C 6 H 2)双吡啶。三配位亚氨基(Ar L)Fe(NAd)的氧化(5)与氯三苯甲烷反应制得(Ar L)FeCl(• NAd)(6),并伴随排出Ph 3 C(C 6 H 5)CPh 2。相应的芳基/烷基酰亚胺/亚氨基双(3,2 ; 5,6)的特点是EPR,零场57的Fe穆斯堡尔,磁力测定,单晶X射线衍射,XAS和用于EXAFS 6。的高自旋(小号= 5 / 2)显示出imidos特征短的Fe-N键(3:1.708(4); 5:1.674(11)Å),而相应的亚氨基表现出拉长的Fe–N键(2:1.768(2)Å;
Carbonylative Ring Expansion of Aziridines to β-Lactams with Rhodium-Complexed Dendrimers on a Resin
作者:Shui-Ming Lu、Howard Alper
DOI:10.1021/jo030353r
日期:2004.5.1
Rhodium-complexed dendrimers, supported on a resin, were evaluated as catalysts for the carbonylative ringexpansion reactions of a variety of aziridines with carbon monoxide to give β-lactams. The effects of reaction temperature, solvent, time, and pressure of carbon monoxide on this transformation were also investigated. The dendritic catalysts showed comparable activity to the homogeneous analogue