A Combined Spectroscopic and Computational Study on the Mechanism of Iron-Catalyzed Aminofunctionalization of Olefins Using Hydroxylamine Derived N–O Reagent as the “Amino” Source and “Oxidant”
作者:Sayanti Chatterjee、Ingolf Harden、Giovanni Bistoni、Rebeca G. Castillo、Sonia Chabbra、Maurice van Gastel、Alexander Schnegg、Eckhard Bill、James A. Birrell、Bill Morandi、Frank Neese、Serena DeBeer
DOI:10.1021/jacs.1c11083
日期:2022.2.16
iron-catalyzed direct synthesis of unprotected aminoethers from olefins by a hydroxyl amine derived reagent using a wide range of analytical and spectroscopic techniques (Mössbauer, Electron Paramagnetic Resonance, Ultra-Violet Visible Spectroscopy, X-ray Absorption, Nuclear Resonance Vibrational Spectroscopy, and resonance Raman) along with high-level quantum chemical calculations. The hydroxyl amine derived triflic
在此,我们使用广泛的分析和光谱技术(穆斯堡尔、电子顺磁共振、紫外可见光谱、X 射线吸收、核共振振动光谱和共振拉曼)以及高级量子化学计算。羟基胺衍生的三氟甲磺酸盐充当“氧化剂”以及“氨基”基团供体。它激活高自旋 Fe(II) ( S t = 2) 催化剂 [Fe(acac) 2 (H 2 O) 2 ] ( 1 ) 生成高自旋 ( S t = 5/2) 中间体 ( Int一世),它衰变为S t = 2 的第二个中间体 ( Int II ) 。光谱和计算数据的分析导致Int I的公式化为 [Fe(III)(acac) 2 - N-酰氧基](烷基-过氧-Fe(III)类似物)。此外,Int II由 N-O 键均裂形成。然而,它不会产生高价 Fe(IV)(NH) 物质(Fe(IV)(O) 类似物),而是产生强烈反铁磁耦合的高自旋 Fe(III) 中心(J = - 524 cm –1 ) 到亚氨基自由基