摘要
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.
Co-polymer of 4-vinylpyridine and styrene was used as polymer-support in the preparation of palladium (0) catalyst.The poly (4?vinylpyridine)Pd(0) catalyst obtained was used in the vinylation reactions of aryl iodides, giving good yields of cinnamic acids, cinnamides and stilbenes. The catalyst was stable to air and moisture, and could be recycled about 10 times using sodium acetate as the base in aqueous DMF solution. The vinylation reactions could be carried out without protection with inert gas.
出处
《分子催化》
EI
CAS
CSCD
1989年第2期165-167,共3页
Journal of Molecular Catalysis(China)
基金
自然科学基金资助项目
