Dramatically Accelerated Selective Oxygen-Atom Transfer by a Nonheme Iron(IV)-Oxo Complex: Tuning of the First and Second Coordination Spheres
作者:Leland R. Widger、Casey G. Davies、Tzuhsiung Yang、Maxime A. Siegler、Oliver Troeppner、Guy N. L. Jameson、Ivana Ivanović-Burmazović、David P. Goldberg
DOI:10.1021/ja410240c
日期:2014.2.19
The new ligand N3PyamideSR and its FeII complex [FeII(N3PyamideSR)](BF4)2 (1) are described. Reaction of 1 with PhIO at −40 °C gives metastable [FeIV(O)(N3PyamideSR)]2+ (2), containing a sulfide ligand and a single amide H-bond donor in proximity to the terminal oxo group. Direct evidence for H-bonding is seen in a structural analogue, [FeII(Cl)(N3PyamideSR)](BF4)2 (3). Complex 2 exhibits rapid O-atom
描述了新配体 N3PyamideSR 及其 FeII 复合物 [FeII(N3PyamideSR)](BF4)2 (1)。1 与 PhIO 在 -40 °C 下反应产生亚稳态 [FeIV(O)(N3PyamideSR)]2+ (2),包含硫化物配体和靠近末端氧代基团的单个酰胺 H 键供体。在结构类似物 [FeII(Cl)(N3PyamideSR)](BF4)2 (3) 中可以看到 H 键合的直接证据。复合物 2 表现出对外部硫化物底物的快速 O 原子转移 (OAT),但没有分子内 OAT。然而,在 1 与 mCPBA 的反应中确实会发生直接的 S-氧化,产生亚砜连接的 [FeII(N3PyamideS(O)R)](BF4)2 (4)。还观察到具有 1 的催化 OAT。