Efficient hydroxylation of aromatic compounds catalyzed by an iron(II) complex with H<sub>2</sub>O<sub>2</sub>
作者:Xiao Wang、Tianyong Zhang、Bin Li、Qiusheng Yang、Shuang Jiang
DOI:10.1002/aoc.3178
日期:2014.9
A mononuclear iron(II) complex, Et4N[Fe(C10H6NO2)3], coordinated by three 1‐nitroso‐2‐naphtholate ligands in a fac‐N3O3 geometry, was initiated to catalyze the direct hydroxylation of aromatic compounds to phenols in the presence of H2O2 under mild conditions. Various reaction parameters, including the catalyst dosage, temperature, mole ratio of H2O2 to benzene, reaction time and solvents which could
启动了以fac‐N 3 O 3几何形状的三个1-亚硝基-2-萘甲酸配体配位的单核铁(II)络合物Et 4 N [Fe(C 10 H 6 NO 2)3 ]。在温和条件下在H 2 O 2存在下将芳族化合物直接羟基化为酚。各种反应参数,包括催化剂用量,温度,H 2 O 2摩尔比对于苯的羟基化反应,系统地研究了影响催化剂羟基化活性的反应时间和溶剂,以实现理想的苯转化率和较高的苯酚分布。在最佳条件下,苯转化率为10.2%,仅检测到苯酚。还发现该催化剂对具有高底物转化率的其他芳族化合物的羟基化具有活性。确定由于催化剂和H 2 O 2的反应而形成的羟基自由基是羟基化反应中的关键活性中间体。提出了形成羟基自由基的合理途径,并通过密度泛函理论计算证明了其合理性。版权所有©2014 John Wiley&Sons,Ltd.