A novel thermo and pH-double sensitive hydrogel immobilized Pd catalyst for Heck and Suzuki reactions in aqueous media

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• 作者：Yaying Zhang^a ; Jianhua Yang^a ; Xi Zhang^a ; Fengling Bian^a ; ^{bianfl@lzu.edu.cn} ; Wei Yu^b
• 关键词：Sensitive hydrogel ; Palladium ; Heck reaction ; Suzuki reaction ; Aqueous media
• 刊名：Reactive and Functional Polymers
• 出版年：2012
• 期刊代码：92_13815148
• 类别：ch
• 出版时间：April, 2012
• 卷：72
• 期：4
• 页码：233-241
• 文件大小：2220 K

摘要

A novel Hydrogel (1) was prepared from N-isopropylacrylamide, 4-vinylpyridine and potassium acrylate by free radical cross-linking polymerization. Hydrogel (1) showed both thermosensitivity and pH-sensitivity, and exhibited high swelling capacity in water. Because Hydrogel (1) has porous structure in its network and good loading performance with Pd²⁺, it was used as 鈥渕icroreactor鈥?for immobilization of metal nanoparticles. We chose Heck and Suzuki reaction of aryl halides in water as test reaction to probe the catalytic activity of such Hydrogel (1) supported palladium catalyst. As a result, the Hydrogel (1)-Pd (II) catalyst exhibited good catalytic activity in both Heck and Suzuki reactions. Moreover, the Hydrogel (1)-Pd (II) catalyst was easily recovered and recycled. The reuse experiments showed that it was recycled six times without obviously losing of catalytic activity.