| 纤维素在离子液体中的均相乙酰化及其选择性 |
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| 引用本文： | 武进,张昊,张军,何嘉松.纤维素在离子液体中的均相乙酰化及其选择性[J].高等学校化学学报,2006,27(3):592-594. |
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| 作者姓名： | 武进 张昊 张军 何嘉松 |
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| 作者单位： | 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 |
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| 基金项目： | 科技部科研项目;中国科学院资助项目 |
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| 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.
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| 关 键 词： | 离子液体 均相乙酰化 取代基分布 区域选择性 |
| 文章编号： | 0251-0790（2006）03-0592-03 |
| 收稿时间： | 03 17 2005 12:00AM |
| 修稿时间： | 2005-03-17 |
Homogeneous Acetylation and Regioselectivity of Cellulose in a New Ionic Liquid |
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| WU Jin,ZHANG Hao,ZHANG Jun,HE Jia-Song.Homogeneous Acetylation and Regioselectivity of Cellulose in a New Ionic Liquid[J].Chemical Research In Chinese Universities,2006,27(3):592-594. |
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| Authors: | WU Jin ZHANG Hao ZHANG Jun HE Jia-Song |
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| Institution: | CAS Key Laboratory of Engineering Plastics, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080, Chinct |
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| 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. |
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| Keywords: | Cellulose Ionic liquid Homogeneous acetylation Distribution of substituent Regioselectivity |
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