N–heterocyclic carbene Cu complex) immobilized on nano–silica, (Cu II–NHCs) n@nSiO 2, and its application as an efficient and reusable catalyst in the synthesis of benzimidazoles, benzothiazoles, 1,2,3–triazoles, bis–triazoles and sonogashira–hagihara reactions]]>

摘要

The present study describes the synthesis and characterization of a new poly(N–heterocyclic carbene Cu complex) immobilized on nano silica, (CuII–NHCs)n@nSiO2. The (CuII–NHCs)n@nSiO2dendritic polymer was characterized by FT–IR, TGA, UV–vis, FE–SEM, TEM and ICP–OES techniques. The catalytic activity of this new catalyst was studied in the synthesis of benzimidazoles, benzothiazoles, 1,2,3–triazoles,bis–triazoles and Sonogashira–Hagihara cross–coupling reactions. The (CuII–NHCs)n@nSiO2heterogeneous catalyst showed the advantages such as high efficiency, good to excellent yield, short reaction times, easy separation and high reusability of the catalyst.