title: Highly efficient propionylation and butyralation of cellulose in an ionic liquid catalyzed by 4-dimethylminopyridine.
abstract: Using 4-dimethylaminopyridine (DMAP) as the catalyst, highly efficient propionylation and butyralation of cellulose were successfully carried out in an ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl) under mild conditions. Cellulose propionate (CP) and cellulose butyrate (CB) with a degree of substitution (DS) in the range from 0.89 to 2.89 were synthesized within only 30 min at 30 °C. The DS values of the products could be well controlled just by molar ratio of acid anhydride/anhydroglucose unit (AGU). More interestingly, the conversions of acid anhydrides in both propionylation and butyralation were as high as above 90%, even 96%. Therefore, this work provides a facile and highly efficient way for the synthesis of cellulose esters CP and CB.
authors.affiliation: School of Material Science and Engineering, BeiHang University, Beijing 100191, China.
authors.forename: Yihao
authors.initials: Y
authors.lastname: Luan
authors.forename: Jinming
authors.initials: J
authors.lastname: Zhang
authors.forename: Maosheng
authors.initials: M
authors.lastname: Zhan
authors.forename: Jin
authors.initials: J
authors.lastname: Wu
authors.forename: Jun
authors.initials: J
authors.lastname: Zhang
authors.forename: Jiasong
authors.initials: J
authors.lastname: He
mesh_terms: D015761:4-Aminopyridine / Q000031:analogs & derivatives* / Q000737:chemistry; D000498:Allyl Compounds / Q000737:chemistry; D002087:Butyrates / Q000737:chemistry*; D002384:Catalysis; D002482:Cellulose / Q000737:chemistry*; D007093:Imidazoles / Q000737:chemistry; D052578:Ionic Liquids / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D011422:Propionates / Q000737:chemistry*; D013696:Temperature
chemical_list: C544334:1-allyl-3-methylimidazolium; D000498:Allyl Compounds; D002087:Butyrates; D007093:Imidazoles; D052578:Ionic Liquids; D011422:Propionates; D002482:Cellulose; D015761:4-Aminopyridine; C003885:4-dimethylaminopyridine