R.C. Sun

Homogeneous acylation of eucalyptus wood at room temperature in dimethyl sulfoxide/N-methylimidazole.

Succinoylation and benzoylation of ball-milled eucalyptus wood using succinic anhydride and benzoyl chloride as acylating reagent, respectively, were investigated at room temperature using dimethyl sulfoxide/N-methylimidazole (DMSO/NMI) as reaction medium without additional catalysts. The effects of the corresponding acylating reagent dosage (1-5:1 for succinoylation and 0.5-5:1 for benzoylation) and reaction time (0.35-5h for succinoylation and 0.5-3h for benzoylation) on the extent of acylation, measured by weight percent gain (WPG), were studied. WPG of succinoylation and benzoylation was in the range of 70.8-144.7% and 17.3-43.1%, respectively. The efficiency of acylation at room temperature significantly increased in DMSO/NMI compared with ionic liquid 1-butyl-3-methylimidazolium chloride because of the role of NMI as solvent, base and catalyst. Fourier transform infrared (FT-IR), and solid-state cross-polarization/magic-angle spinning (CP/MAS) (13)C nuclear magnetic resonance (NMR) spectroscopy studies provided evidence for the occurrence of succinoylation and benzoylation reactions and the attachment of functional groups via ester bonds.

Chemical Modification of Cellulose with Succinic Anhydride in Ionic Liquid with or without Catalysts

CF Liu1, AP Zhang2,3, WY Li1 and RC Sun1,4 1State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, 2Institute of New Energy and New Material, South China Agricultural University, 3Biomass Energy Key Laboratory of Guangdong Regular Higher Education Institutions, South China Agricultural University, 4Institute of Biomass Chemistry and Technology, Beijing Forestry University, China