Homogeneous Acetylation and Regioselectivity  of Cellulose in a New Ionic Liquid

Abstract

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 DS_C-2 DS_C-3 for substitutes was observed in the product with acetic anhydride/pyridine system.

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

CLC Number:

O631

TrendMD:

WU Jin, ZHANG Hao, ZHANG Jun, HE Jia-Song. Homogeneous Acetylation and Regioselectivity of Cellulose in a New Ionic Liquid[J]. Chem. J. Chinese Universities, 2006, 27(3): 592.

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Homogeneous Acetylation and Regioselectivity of Cellulose in a New Ionic Liquid

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