壳聚糖席夫碱钯配合物催化碘代苯与苯乙烯交叉偶联反应的研究

水杨醛与壳聚糖反应制得壳聚糖席夫碱配体,此配体与钯盐反应得到壳聚糖席夫碱钯催化剂.研究了该催化剂对碘代苯(PhI)与苯乙烯偶联生成反式-二苯乙烯的催化性能.考察了不同反应因素(原料比、缚酸剂种类及其用量、反应温度、溶剂、催化剂用量、反应时间)对该反应的影响,由此确定了该催化反应的最佳反应条件.该催化剂经过滤分离、溶剂洗涤,循环使用6次仍有较高的催化活性,该催化剂对取代碘苯与苯乙烯的反应也有较高的催化活性.

Study On the Cross-coupling Reaction about Iodobenzene and Styrene Catalyzed by Chitosan Schiff-base Palladium Catalyst

Chitosan Schiff-base Palladium catalyst was synthesized from chitosan and salicylaldehyde via grafting to form chitosan Schiff-base,followed by coordination with palladium salt.We studied the performance of this catalyst for the cross-coupling reaction of iodobenzene and styrene.Effect of different reaction conditions(molar ratio of iodobenzene and styrene,kind and amount of base,reaction temperature,solvent,amount of catalyst,reaction time) on yields was investigated.The best condition of the reaction was obtained.By filtrating from the reaction mixture and washing with the solvent,the catalyst could be reused for 6 times without the loss of activity.It can also catalyze the coupling reaction of iodobenzene derivatives with styrene in high yields.