Abstract

Graphene oxide-supported Bronsted acidic ionic liquid ([GrBenzImi]SO₃H) has been prepared by covalent grafting of benzimidazole unit in the matrix of graphene oxide followed by reaction with 1,4-butane sultone and hydrochloric acid. [GrBenzImi]SO₃H has been characterized by various techniques including Fourier transform infrared spectroscopy (FTIR), FT-Raman (FT-Raman spectroscopy), CP-MAS ¹³C NMR spectroscopy, thermogravimetric analysis, energy-dispersive X-ray analysis, Brunauer–Emmett–Teller surface area, X-ray diffraction, and transmission electron microscopy. [GrBenzImi]SO₃H was successfully employed as heterogeneous catalyst in A³-coupling reaction of aryl aldehydes, anilines and phenylacetylene for the synthesis of 2,4-disubstituted quinolines using water/ethanol system (1:1) as green medium. [GrBenzImi]SO₃H could be recycled six times without significant loss in the yield of product.

Graphic abstract

中文翻译：

---

氧化石墨烯负载的布朗斯台德酸性离子液体通过A 3偶联绿色合成喹啉

摘要

通过将苯并咪唑单元共价接枝到氧化石墨烯的基质中，然后与1,4-丁烷磺酸内酯和盐酸反应，制备了氧化石墨烯负载的布朗斯台德酸性离子液体（[GrBenzImi] SO ₃ H）。[GrBenzImi] SO ₃ H已通过多种技术进行了表征，包括傅立叶变换红外光谱（FTIR），傅立叶变换拉曼光谱（FT-Raman光谱），CP-MAS ¹³ C NMR光谱，热重分析，能量色散X射线分析， Brunauer-Emmett-Teller表面积，X射线衍射和透射电子显微镜。[GrBenzImi] SO ₃ H成功地用作A ^3中的非均相催化剂水/乙醇体系（1：1）为绿色介质，通过芳基醛，苯胺和苯乙炔的α-偶联反应合成2,4-二取代的喹啉。[GrBenzImi] SO ₃ H可以循环使用六次而不会显着降低产品的收率。

图形摘要