Marina Thierry
Amel Majira
Bruce Pégot
Laurent Cezard
Flavien Bourdreux
Gilles Clément
Dr. François Perreau
Stéphanie Boutet‐Mercey
Patrick Diter
Giang Vo‐Thanh
Catherine Lapierre
Paul‐Henri Ducrot
Emmanuel Magnier
Stéphanie Baumberger
Betty Cottyn
2017-10-19
<p>The demethylation of lignin in ionic liquids (ILs) was investigated by using pure lignin model monomers and dimers together with dioxane‐isolated lignins from poplar, miscanthus, and maize. Different methylimidazolium ILs were compared and the samples were treated with two different heating processes: microwave irradiation and conventional heating in a sealed tube. The conversion yield and influence of the treatment on the lignin structure were assessed by <sup>31</sup>P NMR spectroscopy, size‐exclusion chromatography, and thioacidolysis. The acidic methylimidazolium IL [HMIM]Br was shown to be an effective combination of solvent and reagent for the demethylation and depolymerization of lignin. The relatively mild reaction conditions, the clean work‐up, and the ability to reuse the IL makes the described procedure an attractive and new green method for the conversion of lignin to produce phenol‐rich lignin oligomers.</p>
https://doi.org/10.1002/cssc.201701668
oai:zenodo.org:2594599
eng
Zenodo
https://doi.org/10.1002/cssc.201701668
https://zenodo.org/communities/720303
https://zenodo.org/communities/eu
info:eu-repo/semantics/openAccess
Creative Commons Attribution 4.0 International
https://creativecommons.org/licenses/by/4.0/legalcode
ChemSusChem, 11(2), 439-448, (2017-10-19)
biomass
dealkylation
ionic liquids
green chemistry
lignin
Imidazolium-Based Ionic Liquids as Efficient Reagents for the C–O Bond Cleavage of Lignin
info:eu-repo/semantics/article