Transition-metal-free conversion of lignin model compounds to high-value aromatics: scope and chemoselectivity

2018 ◽  
Vol 20 (16) ◽  
pp. 3761-3771 ◽  
Author(s):  
Tae Woo Lee ◽  
Jung Woon Yang
Keyword(s):  
Transition Metal ◽  
Free Base ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Metal Free ◽  
Aromatic Alcohols ◽  
Lignin Model

A simple transition-metal-free base-promoted oxidative dehomologation of dilignol model compounds to the corresponding aromatic alcohols and acids was demonstrated.

Unprecedented organocatalytic reduction of lignin model compounds to phenols and primary alcohols using hydrosilanes

2014 ◽  
Vol 50 (7) ◽  
pp. 862-865 ◽  
Author(s):  
Elias Feghali ◽  
Thibault Cantat
Keyword(s):  
Primary Alcohols ◽  
Model Compounds ◽  
Efficient Catalyst ◽  
Lignin Model Compounds ◽  
Metal Free ◽  
Mild Conditions ◽  
Lignin Model

The first metal-free reduction of lignin model compounds is described. Using inexpensive PMHS and TMDS hydrosilanes as reductants, α-O-4 and β-O-4 linkages are reduced to primary alcohols and phenols under mild conditions using B(C6F5)3as an efficient catalyst.

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.

Covalent triazine framework catalytic oxidative cleavage of lignin models and organosolv lignin

2018 ◽  
Vol 20 (6) ◽  
pp. 1270-1279 ◽  
Author(s):  
Li Zhao ◽  
Song Shi ◽  
Meng Liu ◽  
Guozhi Zhu ◽  
Min Wang ◽  
...  
Keyword(s):  
Oxidative Cleavage ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Metal Free ◽  
Organosolv Lignin ◽  
Lignin Model ◽  
Covalent Triazine Framework

CTFs were used as effective metal-free catalysts for the oxidative cleavage of lignin model compounds and organosolv lignin.

Oxidation of lignin model compounds by organic and transition metal-based electron transfer mediators

2002 ◽  
pp. 1182-1183 ◽  
Author(s):  
Dominic Rochefort ◽  
Robert Bourbonnais ◽  
Dónal Leech ◽  
Michael G. Paice
Keyword(s):  
Electron Transfer ◽  
Transition Metal ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Lignin Model

Breakdown of lignins, lignin model compounds, and hydroxy-aromatics, to C1 and C2 chemicals via metal-free oxidation with peroxide or persulfate under mild conditions

RSC Advances ◽  
2014 ◽  
Vol 4 (34) ◽  
pp. 17931-17934 ◽  
Author(s):  
Adam Wu ◽  
Jean Michel Lauzon ◽  
Indah Andriani ◽  
Brian R. James
Keyword(s):  
Aqueous Solutions ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Ambient Temperatures ◽  
Metal Free ◽  
Mild Conditions ◽  
Aromatic Components ◽  
Lignin Model ◽  
Free Oxidation

The aromatic components of lignin model compounds and lignins are degraded in basic, aqueous solutions using H2O2or K2S2O8, even at ambient temperatures, to mainly MeOH, formate, carbonate, and oxalate.

A Metal-Free, Carbon-Based Catalytic System for the Oxidation of Lignin Model Compounds and Lignin

ChemPlusChem ◽  
2014 ◽  
Vol 79 (6) ◽  
pp. 825-834 ◽  
Author(s):  
Yongjun Gao ◽  
Jiaguang Zhang ◽  
Xi Chen ◽  
Ding Ma ◽  
Ning Yan
Keyword(s):  
Catalytic System ◽  
Free Carbon ◽  
Model Compounds ◽  
Lignin Model Compounds ◽  
Metal Free ◽  
Lignin Model ◽  
Carbon Based

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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