科研之友
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摘要
A heterogeneous catalyst system based on the immobilization of Pd-0 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 Pd-0 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 Pd-0.
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