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A heterogeneous catalyst system based on the immobilization of Pd0 nanoparticles onto organofunctionalized kaolin is reported with a view to introducing new synthetic routes of directed C–H functionalization of arylpyrazoles. Various characterization techniques revealed that the functional groups, 3-aminopropyltriethoxysilane (APTES) and phenyltrimethoxysilane, become strongly attached to the kaolin surface through Si–O–Si bonds and 3–6 nm sized Pd0 nanoparticles are uniformly decorated and stabilized through the organic amine moieties. The nano-palladium catalyst is durable, undergoing five times reuse with moderate catalytic activity. The XPS analysis of the catalyst before and after reaction suggested that the reaction might be performed via a catalytic cycle that begins with Pd0.

rsc advances

Palladium nanoparticles supported on organofunctionalized kaolin as an efficient heterogeneous catalyst for directed C–H functionalization of arylpyrazoles