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前文报道了聚[(苯乙烯)联吡啶]钯(0)催化剂在芳基碘化物乙烯基化反应中的应用,其催化剂的活性较高,但连续使用三次后,活性明显降低.本文继续报道能用于芳基碘化物乙烯基化反应的高分子负载钯催化剂的合成和应用.据文献报道能用于芳基碘化物乙烯基化的高分子负载钯催化剂,都是通过多步反应将配体导入聚苯乙烯骨架上合成的,操作比较复杂.为了简化催化剂的制备方法,我们探索了用聚(4-乙烯基吡啶)作高分子载体的可能性.将4 乙烯基吡啶与苯乙烯共聚,加入2%二乙烯基苯作交联剂,生成的共聚物用醋酸钯处理后,加氢化铝锂还原,得到每克含钯7.0mg、氮33.7mg的催化剂,并研究了它在芳基碘化物与苯乙烯、丙烯酸和丙烯酰胺的反应中的催化性能.
The previous report reported the poly [(styrene) bipyridine] palladium (0) catalyst aryl aryl iodide vinylation of the reaction, the catalyst activity is high, but after three consecutive use, the activity was significantly reduced.This article continues to report Synthesis and application of polymer-supported palladium catalyst for vinyl iodination of aryl iodides It has been reported in the literature that polymer-supported palladium catalysts which can be used for vinylation of aryl iodides are prepared by a multi- In order to simplify the preparation of the catalyst, we explored the possibility of using poly (4-vinylpyridine) as a polymer carrier. Copolymerization of 4-vinylpyridine with styrene , 2% divinylbenzene was added as a cross-linking agent, the resulting copolymer was treated with palladium acetate, and lithium aluminum hydride reduction was carried out to obtain 7.0 mg of palladium and 33.7 mg of nitrogen per gram of catalyst. Catalytic properties of the reaction of iodide with styrene, acrylic acid and acrylamide.