Low-Valent α-Diimine Iron Complexes for Catalytic Olefin Hydrogenation
作者:Suzanne C. Bart、Eric J. Hawrelak、Emil Lobkovsky、Paul J. Chirik
DOI:10.1021/om050625b
日期:2005.11.1
solvents afforded the bis(α-diimine) complex [ArNC(Me)C(Me)NAr]2Fe, which has also been crystallographically characterized. The arene complexes and the bis(α-diimine) complexes are inactive for catalytic olefin hydrogenation. Performing the reduction in the presence of internal alkynes such as diphenylacetylene and bis(trimethylsilyl)acetylene furnished the alkyne adducts [ArNC(Me)C(Me)NAr]Fe(η2-RC⋮CR)
Regio- and Diastereoselective Iron-Catalyzed [4+4]-Cycloaddition of 1,3-Dienes
作者:C. Rose Kennedy、Hongyu Zhong、Rachel L. Macaulay、Paul J. Chirik
DOI:10.1021/jacs.9b02443
日期:2019.5.29
characterized by single-crystal X-raydiffraction, Mößbauer spectroscopy, magnetic measurements, and DFT calculations. The structural and spectroscopic parameters are consistent with an electronic structure description comprised of a high spin iron(I) center ( SFe = 3/2) engaged in antiferromagnetically coupling with a ligand radical anion ( SPI = -1/2). Mechanistic studies conducted with these single-component
Bis(α-diimine)iron Complexes: Electronic Structure Determination by Spectroscopy and Broken Symmetry Density Functional Theoretical Calculations
作者:Nicoleta Muresan、Connie C. Lu、Meenakshi Ghosh、Jonas C. Peters、Megumi Abe、Lawrence M. Henling、Thomas Weyhermöller、Eckhard Bill、Karl Wieghardt
DOI:10.1021/ic7022693
日期:2008.6.2
between the pi radical ligands (Srad=1/2) and the ferrous ion (SFe=2) yields the observed St=1 ground state. The study confirms that alpha-diimines are redox noninnocent ligands with an energetically low-lying antibonding pi* lowest unoccupied molecular orbital which can accept one or two electrons from a transition metal ion. The (alpha-diimine)FeCl2 complexes (St=2) are shown to contain a neutral alpha-diimine