A pentanuclear Er (III) coordination cluster as a catalyst for selective synthesis of 1,2‐disubstituted benzimidazoles
作者:Arijit Sarkar、Sourav Jana、Hari Pada Nayek
DOI:10.1002/aoc.6200
日期:2021.6
acetylacetone were treated with Er (NO3)3·5H2O, which resulted in the formation of a pentanuclear coordination cluster [Er5(LH)4(acac)4(μ3‐O)(μ3‐OH)(H2O)2].5H2O (1) (acac = acetylacetonate). Five Er (III) ions are arranged in a nonlinear fashion in 1. Complex 1 was utilized as a catalyst towards the selective synthesis of 1,2‐disubstituted benzimidazole derivatives involving o‐phenylenediamine and different
通过6-甲酰基-2-(羟甲基)-4-叔丁基苯酚和2-氨基-4-硝基苯酚的反应制备了一个新的三齿配体(H 3 L)。配体ħ 3大号和乙酰丙酮用铒(NO处理3)3 ·5H 2 O,这就造成了pentanuclear协调簇[Er构成的一形成5(LH)4(ACAC)4(μ 3 -O)(μ 3 -OH)(H 2 O)2 ] 。5H 2 O(1)(acac =乙酰丙酮)。五个Er(III)离子以1的非线性方式排列。络合物1被用作催化合成涉及邻苯二胺和不同醛的1,2-二取代苯并咪唑衍生物的催化剂。1,2-二取代的苯并咪唑衍生物的产率在66%-91%的范围内。这项研究证明了有史以来第一个采用均和五核镧系配位簇催化1,2-二取代苯并咪唑合成的方法。