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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
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.
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
Cellulose
Ionic liquid
Homogeneous acetylation
Distribution of substituent
Regioselectivity