Self-Assembled Nanocomposite Organic Polymers with Aluminum and Scandium as Heterogeneous Water-Compatible Lewis Acid Catalysts.
Self-Assembled Nanocomposite Organic Polymers with Aluminum and Scandium as Heterogeneous Water-Compatible Lewis Acid Catalysts.
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DOI：
10.1002/anie.201503874
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发表时间：
2015-09
影响因子：
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通讯作者：
H. Miyamura;Arisa Sonoyama;Davit Hayrapetyan;S. Kobayashi
中科院分区：
文献类型：
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作者：
H. Miyamura;Arisa Sonoyama;Davit Hayrapetyan;S. Kobayashi
虽然水相容的刘易斯酸具有作为用于各种有机转化的可获得的和环境友好的催化剂的巨大潜力，但是即使在水性条件下也保持高活性并且没有金属浸出的这种刘易斯酸的有效固定化是具有挑战性的任务。描述了有机聚合物、炭黑、铝还原剂和钪盐的自组装纳米复合催化剂作为非均相水相容性刘易斯酸催化剂。这些催化剂可以成功地应用于各种C-C键形成反应，而不会浸出金属。扫描透射电子显微镜分析表明，在这些非均相催化剂中制备的Al和Sc的纳米复合结构。应注意，通常在水存在下快速分解的Al物质在水性条件下稳定。
While water-compatible Lewis acids have great potential as accessible and environmentally benign catalysts for various organic transformations, efficient immobilization of such Lewis acids while keeping high activity and without leaching of metals even under aqueous conditions is a challenging task. Self-assembled nanocomposite catalysts of organic polymers, carbon black, aluminum reductants, and scandium salts as heterogeneous water-compatible Lewis acid catalysts are described. These catalysts could be successfully applied to various C-C bond-forming reactions without leaching of metals. Scanning transmission electron microscopy analyses revealed that the nanocomposite structure of Al and Sc was fabricated in these heterogeneous catalysts. It is noted that Al species, which are usually decomposed rapidly in the presence of water, are stabilized under aqueous conditions.