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首页> 外文期刊>RSC Advances >Phosphinite-functionalized silica and hexagonal mesoporous silica containing palladium nanoparticles in Heck coupling reaction: synthesis, characterization, and catalytic activity
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Phosphinite-functionalized silica and hexagonal mesoporous silica containing palladium nanoparticles in Heck coupling reaction: synthesis, characterization, and catalytic activity

机译：次膦酸官能化二氧化硅和含钯纳米粒子的六方介孔二氧化硅在Heck偶联反应中的合成，表征和催化活性

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摘要

A series of mono, di and tri phosphinite ligands functionalized on modified silica and modified hexagonal mesoporous silica (HMS) were synthesized and characterized. The complexation of these ligands with PdCl2 was carried out to obtain palladium supported on phosphinite functionalized silica. TEM images of the catalysts showed that Pd dispersed in nanoparticle size on these heterogeneous catalytic systems. Hexagonal and mesoporous structures with high surface area of HMS were examined by SEM, TEM and BET techniques. In a typical Heck coupling reaction (HCR), catalytic activity of the Pd catalysts was compared. It was shown that di-functionalized phosphinite ligands react better for both silica and HMS. Aryl halides (also known as haloarenes or halogenoarenes) of different varieties with olefinic substrates in the HCR exhibited high efficiency and stability for the selected catalyst. Repeating Heck reaction cycles illustrated that the catalyst could be recycled.
机译：合成并表征了在改性二氧化硅和改性六角形介孔二氧化硅（HMS）上官能化的一系列单，二和三亚膦酸酯配体。进行这些配体与PdCl 2的络合，得到负载在次膦酸酯官能化的二氧化硅上的钯。催化剂的TEM图像表明，Pd以纳米粒度分散在这些非均相催化体系上。通过SEM，TEM和BET技术检查了HMS高表面积的六角和中孔结构。在典型的Heck偶联反应（HCR）中，比较了Pd催化剂的催化活性。结果表明，双官能化次膦酸酯配体对二氧化硅和HMS的反应更好。在HCR中具有烯烃底物的不同品种的芳基卤化物（也称为卤代芳烃或卤代芳烃）表现出较高的效率和稳定性。重复的Heck反应循环说明催化剂可以再循环。

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