scholarly journals Nucleophilic Cleavage of Lignin Model Compounds under Acidic Conditions in an Ionic Liquid: A Mechanistic Study

ChemPlusChem ◽  
2018 ◽  
Vol 83 (5) ◽  
pp. 348-353 ◽  
Author(s):  
William E. S. Hart ◽  
Leigh Aldous ◽  
Jason B. Harper
Keyword(s):  
Ionic Liquid ◽  
Mechanistic Study ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Nucleophilic Cleavage ◽  
Lignin Model ◽  
Acidic Conditions

Hydrolytic Cleavage of β-O-4 Ether Bonds of Lignin Model Compounds in an Ionic Liquid with Metal Chlorides

2011 ◽  
Vol 50 (2) ◽  
pp. 849-855 ◽  
Author(s):  
Songyan Jia ◽  
Blair J. Cox ◽  
Xinwen Guo ◽  
Z. Conrad Zhang ◽  
John G. Ekerdt
Keyword(s):  
Ionic Liquid ◽  
Hydrolytic Cleavage ◽  
Model Compounds ◽  
Metal Chlorides ◽  
Lignin Model Compounds ◽  
Lignin Model

Ionic liquid [OMIm][OAc] directly inducing oxidation cleavage of the β-O-4 bond of lignin model compounds

2017 ◽  
Vol 53 (63) ◽  
pp. 8850-8853 ◽  
Author(s):  
Yingying Yang ◽  
Honglei Fan ◽  
Qinglei Meng ◽  
Zhaofu Zhang ◽  
Guanying Yang ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Aromatic Compounds ◽  
Aerobic Oxidation ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Metal Free ◽  
Lignin Model

Ionic liquids can effectively induce the transformation of lignin model compounds into aromatic compounds by aerobic oxidation under metal-free conditions.

Free radical reaction promoted by ionic liquid: a route for metal-free oxidation depolymerization of lignin model compound and lignin

2015 ◽  
Vol 51 (19) ◽  
pp. 4028-4031 ◽  
Author(s):  
Yingying Yang ◽  
Honglei Fan ◽  
Jinliang Song ◽  
Qinglei Meng ◽  
Huacong Zhou ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Model Compound ◽  
Radical Reaction ◽  
Free Radical Reaction ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Lignin Model Compound ◽  
Organosolv Lignin ◽  
Lignin Model ◽  
Free Oxidation

Ionic liquid can efficiently promote the transformation of lignin model compounds and organosolv lignin.

A comparison of the oxidation of lignin model compounds in conventional and ionic liquid solvents and application to the oxidation of lignin

RSC Advances ◽  
2016 ◽  
Vol 6 (106) ◽  
pp. 104742-104753 ◽  
Author(s):  
Soledad G. Yao ◽  
Mark S. Meier ◽  
Robert B. Pace III ◽  
Mark Crocker
Keyword(s):  
Ionic Liquid ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Lignin Model ◽  
Soluble P

The oxidation of lignin model compounds in ionic liquid solvents was investigated as a prelude to the oxidation of lignin in these solvents where the polymer is appreciably soluble.

Application of a Pyroprobe–Deuterium NMR System: Deuterium Tracing and Mechanistic Study of Upgrading Process for Lignin Model Compounds

2016 ◽  
Vol 30 (4) ◽  
pp. 2968-2974 ◽  
Author(s):  
Haoxi Ben ◽  
Mark W. Jarvis ◽  
Mark R. Nimlos ◽  
Erica L. Gjersing ◽  
Matthew R. Sturgeon ◽  
...  
Keyword(s):  
Mechanistic Study ◽  
Deuterium Nmr ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Lignin Model ◽  
Deuterium Tracing

Recyclable ionic liquid tagged Co(salen) catalysts for the oxidation of lignin model compounds

2013 ◽  
Vol 91 (12) ◽  
pp. 1258-1261 ◽  
Author(s):  
Kenson Ambrose ◽  
Bitu B. Hurisso ◽  
Robert D. Singer
Keyword(s):  
Ionic Liquid ◽  
Liquid Phase ◽  
Model Compound ◽  
Veratryl Alcohol ◽  
Pure Oxygen ◽  
Model Compounds ◽  
Imidazolium Ionic Liquid ◽  
Lignin Model Compounds ◽  
Lignin Model Compound ◽  
Lignin Model

Ionic liquid tagged salen ligands containing two proximal 1,3-disubstituted imidazolium ionic liquid cores form cobalt(III) complexes capable of selectively oxidizing veratryl alcohol, a lignin model compound, to veratraldehyde using air or pure oxygen as the source of oxygen. Entrainment of these catalysts in either 1-butyl-3-methylimidazolium hexafluorophosphate, [bmim][PF6], or 1-butyl-3-methylimidazolium bistriflimide, [bmim][NTf2], hydrophobic ionic liquid solvents, results in biphasic reactions when water is used as the second solvent allowing the catalyst/ionic liquid phase to be recycled.

scholarly journals A two-phase reaction system for selective oxidative degradation of lignin model compounds

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 6526-6538
Author(s):  
Yueying Chen ◽  
Aiguo Xue ◽  
Haomin Jiang ◽  
Yujuan Cheng ◽  
Yuan Ren ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Oxidative Degradation ◽  
Reaction System ◽  
Value Added ◽  
Bottom Phase ◽  
Phase Reaction ◽  
Model Compounds ◽  
Two Phase ◽  
Lignin Model Compounds ◽  
Lignin Model

Lignin depolymerization through an oxidation method could provide value-added products, but it is challenging in terms of recovering catalysts or separating products in time to avoid over-oxidation. In this study, a process of selectively oxidative degradation of lignin model compounds was operated in a two-phase reaction system. Lignin model compounds of 4-benzyloxyphenol (PBP) or guaiacylglycerol-β-guaiacyl ether (GGE) in a bottom phase of 1-butyl-3-methylimidazole chloride ([BMIM]Cl) ionic liquid were selectively oxidized by H2O2 in the presence of a solid acid (SO42-/Fe2O3-ZrO2), and the degradation products immediately diffused into the upper organic solvent phase (butyl acetate). In this kind of reaction system, the yield of the products was improved due to the prolonged life of ∙OH in ionic liquid, and the product selectivity was maintained due to the timely product separation, and the ionic liquid and the catalyst were easily recycled.

Lignin to Value-Added Chemical Synthesis

2020 ◽  
Vol 16 ◽  
Author(s):  
Mahdieh Sharifi ◽  
Ramyakrishna Pothu ◽  
Rajender Boddula ◽  
Inamuddin
Keyword(s):  
Ionic Liquids ◽  
Lignocellulosic Biomass ◽  
Academic Research ◽  
Power Saving ◽  
Value Added ◽  
Glycerol Ether ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Biomass Activity ◽  
Lignin Model

Background: There is a developing demand for innovation in petroleum systems replacements. Towards this aim, lignocellulosic biomass suggested as a possible sustainable source for the manufacturing of fuels and produced chemicals. The aims of this paper are to investigate different kinds of β-O-4 lignin model compounds for the production of value-added chemicals in presence of ionic liquids. Especially, a cheap β-O-4 lignin model Guaiacol glycerol ether (GGE) (Guaifenesin) is introduced to produce valuable chemicals and novel products. Methods: Research related to chemical depolymerization of lignocellulosic biomass activity is reviewed, the notes from different methods such as thermal and microwave collected during at least 10 years. So, this collection provides a good source for academic research and it gives an efficient strategy for the manufacturing of novel value-added chemicals at an industrial scale. Results: This research presented that ionic liquid microwave-assisted is a power saving, cost efficient, fast reaction, and clean way with high selectively and purity for production of high value chemicals rather that conversional heating. Guaiacol and catechol are some of these valuable chemicals that is produced from β-O-4 lignin model compounds with high word demands that are capable to produce in industry scale. Conclusion: The β-O-4 lignin model compounds such as Guaiacol glycerol ether (GGE) (Guaifenesin) are good platform for developing food materials, perfumery, biorefinery, and pharmaceutical industry by ionic liquids-assisted lignin depolymerization method.

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