三(羟甲基)氨基甲烷改性SiO_2固载钯纳米粒子:合成、表征及其催化Heck偶联反应活性（英文）

【摘要】：The preparation of supported Pd nanoparticles on Tris(tris(hydroxymethyl)aminomethane)‐ modi‐fied Si O2 gel and their catalytic application in Heck coupling are investigated. The catalyst was char‐acterized using a combination of X‐ray diffraction, transmission electron microscopy, field‐emission scanning electron microscopy, and scanning electron microscopy/energy‐dispersive X‐ray spec‐troscopy. The supported Pd nanoparticles were found to be a highly active and reusable catalyst for the Heck reaction at a low Pd loading(0.02 mol%) because of stabilization by the Tris moieties. Several reaction parameters, including the type and amount of solvent, base, and temperature, were evaluated. The heterogeneity of the catalytic system was investigated using different approaches, and showed that slight Pd leaching into the reaction solution occurred under the reaction condi‐tions. Despite this metal leaching, the catalyst can be reused seven times without significant loss of its activity. 【作者单位】： Pharmaceutical
【关键词】： Supported palladium nanoparticle Heterogeneous catalyst Heck coupling Carbon‐carbon coupling reaction
【基金】：financial support from the Center of Excellence in Sensor and Green Chemistry Research, Isfahan University of Technology
【分类号】：O621.251
【正文快照】： 1. Introduction metal nanoparticles have attracted attention in the field of catalysis because they can catalyze many organic reactions effectively as a result of their high surface area to volume ratio [1]. However, these naked nanoparticles tend to ag

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