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OALib Journal期刊
ISSN: 2333-9721
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固载胍基的强碱树脂合成与表征及其在Knoevenagel缩合反应中的催化作用
DOI: 10.3724/SP.J.1105.2013.12433, PP. 1204-1211
Keywords: 胍,强碱阴离子交换树脂,原位反应,Knoevenagel缩合反应
Abstract:
利用一步原位反应由大孔聚苯乙烯苄胺树脂和单氰胺合成含有胍基官能团的强碱阴离子交换树脂(PG),通过傅立叶红外、酸碱滴定、元素分析、SEM对胍基树脂进行了表征,同时考察了体系中pH值、投料比、温度对原位反应的影响,实验结果表明,在pH值为2的溶液中,大孔树脂氨基交换量与单氰胺的摩尔比为13时,110℃反应5h,树脂的强碱交换量达3.54mmol/g.以胍基强碱树脂为非均相催化剂,催化Knoevenagel缩合反应,探讨了催化剂用量、反应溶剂、反应时间、树脂重复使用等因素对产率的影响,确定了反应的最佳条件.实验结果表明,该树脂具有良好的催化活性,在以乙醇为溶剂,反应时间为5h,强碱树脂固载胍基含量与反应底物的摩尔比为15时,胍基强碱树脂催化Knoevenagel缩合的反应产率达到83.1%~95.3%,胍基强碱树脂可循环使用,在5次重复实验中,其催化活性基本保持.
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