Synthesis and characterization of a new poly(N-heterocyclic carbene Cu complex) immobilized on nano-silica, (CuII-NHCs)n@nSiO2, 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

The present study describes the synthesis and characterization of a new poly(N-heterocyclic carbene Cu complex) immobilized on nano silica, (Cu-II-NHCs)(n)@nSiO(2). The (Cu-II-NHCs)(n)@nSiO(2) dendritic 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 (Cu-II-NHCs)(n)@nSiO(2) heterogeneous catalyst showed the advantages such as high efficiency, good to excellent yield, short reaction times, easy separation and high reusability of the catalyst.