Room temperature Ullmann type C–O and C–S cross coupling of aryl halides with phenol/thiophenol catalyzed by CuO nanoparticles

C–O/C–S cross coupling of aryl halides with phenol or thiophenol was studied under ligand-free condition at room temperature over CuO nanocatalyst. The scope of the reaction was extended to various aryl halides and substituted phenols under optimized condition. In general, efficient, selective, and reusable heterogeneous nano CuO catalytic system has been developed for room temperature C–O and C–S Ullmann type cross coupling reactions.