Efficient cross-coupling of aryl Grignard reagents with alkyl halides by recyclable ionic iron(iii) complexes bearing a bis(phenol)-functionalized benzimidazolium cation
作者:Chong-Liang Xia、Cun-Fei Xie、Yu-Feng Wu、Hong-Mei Sun、Qi Shen、Yong Zhang
DOI:10.1039/c3ob41376d
日期:——
designed and used to prepare ionic iron(III) complexes of the type [H3L][FeX4] (X = Cl, 2; X = Br, 3). Both 2 and 3 were characterized by elemental analysis, Raman spectroscopy, electrospray ionization mass spectrometry and X-ray crystallography. The catalytic performances of 2 and 3 in cross-coupling reactions using aryl Grignard reagents with primary and secondary alkyl halides bearing β-hydrogens were
设计了一种新型的双(苯酚)官能化苯并咪唑鎓盐1,3-双(3,5-二叔丁基-2-羟基苄基)苯并咪唑鎓氯化物(H 3 LCl,1),并用于制备离子铁(III)[H 3 L] [FeX 4 ]类型的络合物(X = Cl,2; X = Br,3)。既2和3进行了元素分析,拉曼光谱,电喷雾电离质谱法和X-射线晶体学进行了表征。2和3的催化性能用芳基格氏试剂与带有β-氢的伯烷基卤和仲烷基卤的交叉偶联反应进行了研究。该分析表明,络合物2具有烷基氯介导的偶联的良好潜力。相比之下,配合物3显示出稍低的催化活性。倾析出包含在醚层中的产物后,可以将络合物2循环至少八次而不会显着降低催化活性。