摘要
冠醚、鏻盐可支载于硅胶而形成有效的相转移催化剂.Sawiki报道,平均分子量为400的聚乙二醇(PEG)支载于硅胶对KOAc与n-C_4H_9Br的反应有明显的催化作用.本文报道硅胶支载不同链长PEG的催化剂在酯化反应和一些亲核取代反应中的催化效能,及PEG链长、催化剂用量、溶剂极性等对催化效能的影响.
Polyethylene glycols with different mean molecular weight (200-1000) were immobilizedonto silica gels. They all exhibited a certain catalytic activity in esterification and somenucleophilic substitution reactions. The influence of the chain length of polyethylene glycol,the dosage of catalyst used and the polarity of the solvents on the catalytic activity werestudied. The catalysts could be used repeatedely seven times with little loss of its activity.
出处
《应用化学》
CAS
CSCD
北大核心
1989年第3期78-80,共3页
Chinese Journal of Applied Chemistry
关键词
硅胶
聚乙醇
相转移催化
Silica gel
Polyethylene glycol
Catalytic activity
Esterification
Nucleophilic substitution
