高等学校化学学报

高等学校化学学报 ›› 2006, Vol. 27 ›› Issue (3): 592.

• 研究简报 • 上一篇    

纤维素在离子液体中的均相乙酰化及其选择性

武进,张昊,张军,何嘉松   

  1. 中国科学院化学研究所,工程塑料重点实验室,高分子科学与材料联合实验室,北京 100080
  • 收稿日期:2005-03-17 出版日期:2006-03-10 发布日期:2006-03-10
  • 通讯作者: 张军(1969年出生)，男，博士，副研究员，主要从事高分子材料的绿色化学及新型高分子复合材料研究. E-mail:jzhang@iccas.ac.cn
  • 基金资助:

    国家重点基础研究发展计划"九七三"项目（批准号： 2004CB719701）和国家自然科学基金(批准号: 50103011)资助

Homogeneous Acetylation and Regioselectivity  of Cellulose in a New Ionic Liquid

WU Jin,ZHANG Hao,ZHANG Jun*,HE Jia-Song   

  1. CAS Key Laboratory of Engineering Plastics,Joint Laboratory of Polymer Science and Materials,
    Institute of Chemistry, Chinese Academy of Sciences,Beijing 100080,China
  • Received:2005-03-17 Online:2006-03-10 Published:2006-03-10

PDF (PC)

被引次数

43

摘要：

在1-烯丙基-3-甲基咪唑氯盐(AMIMCl)离子液体中进行了纤维素的均相乙酰化. 酯化剂为乙酸酐和乙酰氯以及加入或不加入催化剂吡啶. 用滴定法确定了产物的取代度(DS), 根据13C NMR考察了产物的取代度分布. 结果表明: 酰氯酰化的反应速度比酸酐快; 吡啶能加快乙酸酐的酯化反应, 但减慢酰氯的反应; 使用乙酸酐/吡啶酯化时所得产物具有特殊的取代度分布, 即DSC-2>> DS C-3.

关键词: 离子液体; 均相乙酰化; 取代基分布; 区域选择性

Abstract:

Homogeneous acetylation of cellulose in 1-allyl-3-methyl-imidazolium chloride(AMIMCl) was carried out. Acetic anhydride and acetyl chloride were used as acetylating agents in the absence and presence of pyridine. The degree of substitution(DS) of the products and the distribution of substituents were determined by titration and 13C NMR techniques respectively. It was observed that acetyl chloride reacted faster than anhydride. Further,pyridine accelerated the reactions when anhydride was used as the acetylating agent,while it slowed down the reactions when acetyl chloride was used. An interesting distribution of  DSC-2 DSC-3 for substitutes was observed in the product with acetic anhydride/pyridine system.

Key words: Cellulose; Ionic liquid; Homogeneous acetylation; Distribution of substituent; Regioselectivity

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