纤维素在离子液体中的均相乙酰化及其选择性  

Homogeneous Acetylation and Regioselectivity of Cellulose in a New Ionic Liquid

作　　者：武进[1] 张昊[1] 张军[1] 何嘉松[1] 

机构地区：[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

出　　处：《高等学校化学学报》2006年第3期592-594,共3页Chemical Journal of Chinese Universities

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

摘　　要：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 DS_ C-2 DS_ C-3 for substitutes was observed in the product with acetic anhydride/pyridine system.Homogeneous acetylation of cellulose in 1-allyl-3-methyl-imidazolium chloride （AMIMC1） was cartied 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.

关 键 词：纤维素 离子液体 均相乙酰化 取代基分布 区域选择性 

分 类 号：O631[理学—高分子化学]