Pd/CMK-3的合成及其在Suzuki-Miyaura碳-碳偶联反应中的应用

Synthesis of Pd/CMK-3 and its application in Suzuki-Miyaura carbon-carbon coupling reaction

Ordered mesoporous carbon material of CMK-3 was prepared with mesoporous silica SBA-15 as template and sucrose as carbon source, then CMK-3 was loaded mono-dispersed Pd by the impregnation-reduction method.The catalyst system nanoparticles Pd/CMK-3 was characterized by X-ray diffraction (XRD), transmission electron microscope (TEM）and N₂ adsorption-desorption, and the results indicated that CMK-3 was ordered mesoporous structure with pore diameter of 5 nm, and Pd/CMK-3 retained the mesoporous structure with Pd particles of different sizes loaded in the channels.Pd/CMK-3 was used in the ligand-free Suzuki-Miyaura C—C coupling reaction as catalyst.The result showed that Pd/CMK-3 had higher stability and activity compared with activated carbon, and addition of water in the solvent was helpful in increasing yield, so when bromobenzene and benzene boric acid reacted at 70℃ for 6 h with potassium carbonate as the base and EtOH / water as the solvent and Pd/CMK-3 as the catalyst, the yield of biphenyl was up to 89.0%.