Tetrahedron ( IF 2.1 ) Pub Date : 2020-06-05 , DOI: 10.1016/j.tet.2020.131314 Maren Muntzeck , Felix Pippert , René Wilhelm
[BuEt3N][NTf2] can be a superior ionic liquid in a RuCl3 catalyzed oxidative C–H activation reaction compared to standard imidazolium-based ionic liquids. The tetraalkylammonium-based ionic liquid resulted in higher yields. This could be due to the absence of a possible C–H activation on the tetraalkylammonium-based ionic liquid itself. This side reaction could occur with imidazolium-based ionic liquids. The ionic liquid could be recycled and different oxidation agents could be used in the reaction. The best results were obtained with FeCl3 · 6H2O and with a combination of LiCl under an oxygen atmosphere. Up to 83% yield were obtained in the homocoupling of 2-arylpyridines.
中文翻译:
四烷基铵基离子液体对RuCl 3催化的CH活化活化均偶联
与标准咪唑基离子液体相比,[BuEt 3 N] [NTf 2 ]在RuCl 3催化的CH-H氧化活化反应中可以是优良的离子液体。四烷基铵基离子液体的收率更高。这可能是由于在基于四烷基铵的离子液体本身上没有可能的CH活化。这种副反应可能发生在咪唑基离子液体上。可以将离子液体再循环,并且可以在反应中使用不同的氧化剂。在氧气气氛下,使用FeCl 3 ·6H 2 O和LiCl的组合可获得最佳结果。在2-芳基吡啶的均偶联中获得高达83%的产率。