"Polysiloxane-Pd" nanocomposites as recyclable chemoselective hydrogenation catalysts
"Polysiloxane-Pd" nanocomposites as recyclable chemoselective hydrogenation catalysts
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DOI：
10.1021/ja049604j
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发表时间：
2004-07-14
影响因子：
15
通讯作者：
Bandoo, T
中科院分区：
文献类型：
--
作者：
Chauhan, BPS;Rathore, JS;Bandoo, T
通过用聚甲基氢硅氧烷还原Pd（0Ac）（2）来产生聚硅氧烷封装的“Pd”-纳米簇，聚甲基氢硅氧烷用作还原剂以及用于催化活性“Pd”-纳米颗粒的生产和稳定的封端材料。在温和的反应条件下，通过原位或非原位生成的聚硅氧烷稳定的“Pd”-纳米簇实现了官能化共轭烯烃的化学选择性氢化，产率高。电子显微镜，紫外-可见光，和NMR研究的反应混合物在催化转化过程中进行，并结合催化剂中毒实验，明确地证明了作用的聚硅氧烷封装的“Pd”-纳米簇的真实的催化物种。“Pd”-纳米团簇的可回收性通过重复使用反应后留下的固体来建立。
Polysiloxane-encapsulated "Pd"-nanoclusters were generated by reduction of Pd(OAc)(2) with polymethylhydrosiloxane, which functions as a reducing agent as well as a capping material for production and stabilization of catalytically active "Pd"-nanoparticles. Chemoselective hydrogenation of functional conjugated alkenes was achieved by in-situ- or ex-situ-generated polysiloxane-stabilized "Pd"-nanoclusters under mild reaction conditions in high yields. Electron microscopy, UV-vis, and NMR studies of the reaction mixture during the catalytic transformation were performed and, in conjunction with catalyst poisoning experiments, demonstrated unequivocally the role of polysiloxane-encapsulated "Pd"-nanoclusters as the real catalytic species. The recyclability of the "Pd"-nanoclusters was established by reusing the solid left after the reaction.