摘要
壳聚糖与苯甲醛或其衍生物作用制得壳聚糖席夫碱,再与氯化钯锂的甲醇溶液作用,制得壳聚糖亚胺环钯催化剂.该类催化剂对空气和水稳定,对于苯乙烯与芳基碘的交叉偶联反应具有较高的催化活性和选择性,经简单分离回收可重复使用多次.为立体选择性合成各种取代的1,2-二苯乙烯提供了一种制备简单、实用的高活性绿色催化剂体系.
Chitosan-supported imine palladacycle catalysts were synthesized from chitosan and benzaldehyde or its derivatives via grafting to form chitosan Schiff base, followed by treatment with Li2PdCl4 in methanol. These natural polymeric palladacycle catalysts are stable to air and moisture, and can catalyze the cross coupling reaction of aryl iodide with PhCH=CH2 in high activity and selectivity. It can be reused several times by the simple filtration separation from the reaction mixture. It can provide an easy prepared and green catalytic system that is practical and highly active to synthesize stilbene and its derivatives.
出处
《有机化学》
SCIE
CAS
CSCD
北大核心
2007年第1期87-91,共5页
Chinese Journal of Organic Chemistry
