Ligand Effects on Hydrogen Atom Transfer from Hydrocarbons to Three-Coordinate Iron Imides
作者:Ryan E. Cowley、Patrick L. Holland
DOI:10.1021/ic300870y
日期:2012.8.6
A new β-diketiminate ligand with 2,4,6-tri(phenyl)phenyl N-substituents provides protective bulk around the metal without exposing any weak C–H bonds. This ligand improves the stability of reactive iron(III) imido complexes with Fe═NAd and Fe═NMes functional groups (Ad = 1-adamantyl; Mes = mesityl). The new ligand gives iron(III) imido complexes that are significantly more reactive toward 1,4-cyclohexadiene
一种具有2,4,6-三(苯基)苯基N-取代基的新型β-二酮配体,可在金属周围提供保护性主体,而不会暴露任何弱C–H键。该配体提高了具有Fe═NAd和Fe═NMes官能团(Ad = 1-金刚烷基; Mes =甲基)的反应性铁(III)亚氨基配合物的稳定性。新的配体产生的铁(III)酰亚胺基络合物比之前报道的2,6-二异丙基苯基二酮戊二酸酯变体对1,4-环己二烯的反应性强得多。X射线晶体结构分析暗示FeesN–C弯曲,更长的Fe═N键和更多的金属接触是C–H键激活率增加的潜在原因。
C–H activation by a terminal imidoiron(III) complex to form a cyclopentadienyliron(II) product
作者:Ryan E. Cowley、Patrick L. Holland
DOI:10.1016/j.ica.2010.11.031
日期:2011.4
Imido complexes of the late transition metals have the ability to activate C-H bonds through the abstraction of hydrogen atoms from hydrocarbons. This paper describes the apparent hydrogen atom transfer from cyclopentadiene (CpH) to the isolable imidoiron(III) complex L(Me)FeNAd (L(Me) = 2,4-bis(2,6-diisopropylphenylimido)pent-3-yl; Ad = 1-adamantyl) in the presence of 4-tert-butylpyridine ((t)Bupy). The isolated product is not the amidoiron(II) complex, but instead it is L(Me)Fe(Cp)((t)Bupy), the result of amido protonation by additional CpH. The crystal structures of both L(Me)FeCp and L(Me)Fe(Cp)((t)Bupy) are presented, and in the latter compound the Fe-C bonds are longer than in any previously characterized cyclopentadienyliron complex. (C) 2010 Elsevier B.V. All rights reserved.