Graphene oxide -Cu (II) catalyzed synthesis of triazoles from aryl iodides

Copper-catalyzed azidee alkyne cycloaddition (CuAAC), also known as the click reaction, has become one of the most important reactions for the preparation of 1, 2, 3-triazoles [1]. Most of the reported CuAAC studies are on two component (organic azide and alkyne) reaction systems, especially in the synthesis of 1-aryl-1, 2, 3-triazoles. In this system, the organic azides need to be synthesized in advance, and the potential hazards of organic azides, especially in isolation or purification processing, can be problematic. Thus, it is desirable to develop an efficient one-pot methodology that uses aryl halides and sodium azide for direct cycloaddition with alkynes [2]. Graphene oxide based materials have found various applications including sensors, solar cells, catalysis, and gas storage [3, 4]. Covalent modification of graphene involves the reaction of functional molecules and the oxygenated groups on the GO surface such as carboxyl groups at the periphery, and epoxy, hydroxyl, and C=C groups in the basal plane of GO [5]. In this work, we wish to report the design and characterization of a Cu (II) complex supported on graphene oxide. The structural and chemical nature of the catalyst was characterized by a variety of techniques such FT- IR, UV-Vis, EDS, Raman and TG. The catalytic activity of Graphene Oxide–CuII (BAPTE) Cl2 hybrid material was investigated in the three component reaction of sodium azide, phenylacetylene and benzyl halides and the corresponding triazoles were produced in good to excellent yield