Catalytic degradation of lignin model compounds in acidic imidazolium based ionic liquids: Hammett acidity and anion effects

Protic Ionic Liquids: Evolving Structure–Property Relationships and Expanding Applications

“…384 PILs consisting of the MIm cation paired with the anions of Cl, Br, hydrogen sulfate, and BF 4 were able to degrade lignin through hydrolysis of the β-O4 ether linkage. 385 MIm Cl was found to be a better solvent for corn straw and soybean straw lignocellulosic materials than the PILs consisting of MIm with acetate, H 2 PO 4 , or HSO 4 . 386 MIm HSO 4 was used in an optimization study into isolating cellulose and other components from the lignocellulosic feedstock of sugarcane bagasse.…”

“…However, the anions that were more capable of forming stronger hydrogen bonds had a greater ability to dissolve the biomass, and to degrade the lignin. 385 Triethylammonium methanesulfonate was selected as a low viscosity, high conductivity solvent for dissolving lignocellulosic biomass. 388 Electro-oxidative cleavage of this solution resulted in a wide range of aromatic fragments.…”

Characterization of Bamboo after Ionic Liquid-H2O Pretreatment for the Pyrolysis Process

“…Cleavage of the β-O-4 arylk ether bond in guaiacylglycerol-β-guaiacyl ether by hydrogen-bond ionic liquids was reported. More strongly hydrogen bond anion resulted in higher yields of the cleavage products than weakly anions (Cox et al 2011). Therefore, lignin content is decreased significantly by anion such as [Ac] -and [Cl] -.…”

Cleavage of the βO4 linkage of lignin using group 8 pincer complexes: A DFT study

“…The fragmentation of the C OAr linkage tends to generate water-soluble compounds containing phenolic hydroxyl groups [8]. Investigations have been carried out on C O activation of lignin model compounds in solutions [10][11][12][13][14]. Ekerdt and coworkers have studied ␤ O 4 cleavage in ionic liquids/metal solutions [10][11][12].…”

“…Investigations have been carried out on C O activation of lignin model compounds in solutions [10][11][12][13][14]. Ekerdt and coworkers have studied ␤ O 4 cleavage in ionic liquids/metal solutions [10][11][12]. In a recent study, they discovered that in a solution of 1-butyl-3-methylimidazolium chloride ([BMIM]Cl) and water, FeCl 3 , CuCl 2 , and AlCl 3 effectively cleave the ␤ O 4 bond of guaiacylglycerol-␤-guaiacyl ether at 150 • C [12].…”