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Title: Nucleophilic Thiols Reductively Cleave Ether Linkages in Lignin Model Polymers and Lignin

Abstract

Lignin may serve as a renewable feedstock for the production of chemicals and fuels if mild, scalable processes for its depolymerization can be devised. The use of small organic thiols represents a bioinspired strategy to cleave the β–O–4 bond, the most common linkage in lignin. In the present study, synthetic β–O–4 linked polymers were treated with organic thiols, yielding up to 90 % cleaved monomer products. Lignin extracted from poplar was also treated with organic thiols resulting in molecular weight reductions as high as 65 % (Mn) in oxidized lignin. Thiol–based cleavage of other lignin linkages was also explored in small–molecule model systems to uncover additional potential pathways by which thiols might depolymerize lignin. The success of thiol–mediated cleavage on model dimers, polymers, and biomass–derived lignin illustrates the potential utility of small redox–active molecules to penetrate complex polymer matrices for depolymerization and subsequent valorization of lignin into fuels and chemicals.

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1];  [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [1]; ORCiD logo [1]
  1. Michigan State University, East Lansing, MI (United States)
  2. University of Wisconsin, Madison, WI (United States)
Publication Date:
Research Org.:
Great Lakes Bioenergy Research Center, East Lansing, MI (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1680057
Grant/Contract Number:  
SC0018409; FC02-07ER64494
Resource Type:
Accepted Manuscript
Journal Name:
ChemSusChem
Additional Journal Information:
Journal Volume: 13; Journal Issue: 17; Journal ID: ISSN 1864-5631
Publisher:
ChemPubSoc Europe
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Ether; homogeneous catalysis; lignin; polymers; sulfur

Citation Formats

Klinger, Grace E., Zhou, Yuting, Foote, Juliet A., Wester, Abby M., Cui, Yanbin, Alherech, Manar, Stahl, Shannon S., Jackson, James E., and Hegg, Eric L. Nucleophilic Thiols Reductively Cleave Ether Linkages in Lignin Model Polymers and Lignin. United States: N. p., 2020. Web. doi:10.1002/cssc.202001238.
Klinger, Grace E., Zhou, Yuting, Foote, Juliet A., Wester, Abby M., Cui, Yanbin, Alherech, Manar, Stahl, Shannon S., Jackson, James E., & Hegg, Eric L. Nucleophilic Thiols Reductively Cleave Ether Linkages in Lignin Model Polymers and Lignin. United States. https://doi.org/10.1002/cssc.202001238
Klinger, Grace E., Zhou, Yuting, Foote, Juliet A., Wester, Abby M., Cui, Yanbin, Alherech, Manar, Stahl, Shannon S., Jackson, James E., and Hegg, Eric L. Wed . "Nucleophilic Thiols Reductively Cleave Ether Linkages in Lignin Model Polymers and Lignin". United States. https://doi.org/10.1002/cssc.202001238. https://www.osti.gov/servlets/purl/1680057.
@article{osti_1680057,
title = {Nucleophilic Thiols Reductively Cleave Ether Linkages in Lignin Model Polymers and Lignin},
author = {Klinger, Grace E. and Zhou, Yuting and Foote, Juliet A. and Wester, Abby M. and Cui, Yanbin and Alherech, Manar and Stahl, Shannon S. and Jackson, James E. and Hegg, Eric L.},
abstractNote = {Lignin may serve as a renewable feedstock for the production of chemicals and fuels if mild, scalable processes for its depolymerization can be devised. The use of small organic thiols represents a bioinspired strategy to cleave the β–O–4 bond, the most common linkage in lignin. In the present study, synthetic β–O–4 linked polymers were treated with organic thiols, yielding up to 90 % cleaved monomer products. Lignin extracted from poplar was also treated with organic thiols resulting in molecular weight reductions as high as 65 % (Mn) in oxidized lignin. Thiol–based cleavage of other lignin linkages was also explored in small–molecule model systems to uncover additional potential pathways by which thiols might depolymerize lignin. The success of thiol–mediated cleavage on model dimers, polymers, and biomass–derived lignin illustrates the potential utility of small redox–active molecules to penetrate complex polymer matrices for depolymerization and subsequent valorization of lignin into fuels and chemicals.},
doi = {10.1002/cssc.202001238},
journal = {ChemSusChem},
number = 17,
volume = 13,
place = {United States},
year = {Wed Jul 15 00:00:00 EDT 2020},
month = {Wed Jul 15 00:00:00 EDT 2020}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Figures / Tables:

Figure 1 Figure 1: $β$-aryl ether cleavage via thiol nucleophilic attack. A) Enzymatic $β$-aryl ether cleavage of C$α$-oxidized lignin dimers with glutathione (GSH). B) Our previous work, focusing on $β$-O-4 model dimers cleavage with organic thiols (RSH). C) This work, focusing on lignin and lignin-like polymer cleavage using organic thiols to formmore » lignin fragments that can be fed into other processes for subsequent valorization.« less

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