Table 6: Recyclability of CuO nanoparticles as a catalyst.

EntryCycle(Yield %)a

11st97
22nd93
33rd90
44th80
55th78

aIsolated yield, reaction conditions: azole (3 mmol), iodobenzene (3.3 mmol), CuO nanoparticles (0.15 mmol), K2CO3 (3 mmol), and N–N dimethyl formamide (10 mL) at reflux for 3 h.