Ionic iron(III) complexes bearing a dialkylbenzimidazolium cation: Efficient catalysts for magnesium-mediated cross-couplings of aryl phosphates with alkyl bromides
作者:Zhuang Li、Bing Lu、Hongmei Sun、Qi Shen、Yong Zhang
DOI:10.1002/aoc.3671
日期:2017.8
A series of ionic iron(III) complexes of general formula [HLn][FeX4] (HL1 = 1,3‐dibenzylbenzimidazolium cation, X = Cl, 1; HL1, X = Br, 2; HL2 = 1,3‐dibutylbenzimidazolium cation, X = Br, 3; HL3 = 1,3‐bis(diphenylmethyl)benzimidazolium cation, X = Br, 4) were easily prepared in high yields by the direct reaction of FeX3 with 1 equiv. of [HLn]X under mild conditions. All of them were characterized using
一系列通式为[HL n ] [FeX 4 ]的离子铁(III)配合物(HL 1 = 1,3-二苄基苯并咪唑鎓阳离子,X = Cl,1; HL 1,X = Br,2; HL 2 = 1通过将FeX 3与1当量直接反应,可以轻松地高收率制备 3,3-二丁基苯并咪唑鎓阳离子,X = Br,3 ; HL 3 = 1,3-双(二苯基甲基)苯并咪唑鎓阳离子,X = Br,4)。在温和条件下的[HL n ] X值。所有元素均使用元素分析,拉曼光谱和电喷雾电离质谱法以及X射线晶体学进行了表征1和4。在存在镁屑和LiCl的情况下,这些对空气和水分不敏感的络合物在芳基磷酸酯与伯和仲烷基溴化物的直接交叉偶联中具有较高的催化活性,其中络合物4最有效。