Cleaving the β--O--4 bonds of lignin model compounds in an acidic ionic liquid, 1-H-3-methylimidazolium chloride: an optional strategy for the degradation of lignin.
The hydrolysis of β--O--4 bonds in two lignin model compounds was studied in an acidic ionic liquid, 1-H-3-methylimidazolium chloride. The β--O--4 bonds of both guaiacylglycerol-β-guaiacyl ether and veratrylglycerol-β-guaiacyl ether underwent catalytic hydrolysis to produce guaiacol as the primary product with more than 70 % yield at 150 °C. Up to 32 wt % substrate concentration could be treated in the system without a decrease in guaiacol production. The ionic liquid could be reused without loss of activity in guaiacol production from both guaiacylglycerol-β-guaiacyl ether and veratrylglycerol-β-guaiacyl ether. A possible mechanism accounting for the guaiacol production is presented.
Jia
Songyan
S
State Key Laboratory of Fine Chemicals, Dalian University of Technology, 158 Zhongshan Road, Dalian, Liaoning 116012, PR China.
Cox
Blair J
BJ
Guo
Xinwen
X
Zhang
Z Conrad
ZC
Ekerdt
John G
JG
D006868:Hydrolysis; D007093:Imidazoles; D052578:Ionic Liquids; D008031:Lignin / Q000737:chemistry*
D007093:Imidazoles; D052578:Ionic Liquids; D008031:Lignin