Imidazolium‐Based Ionic Liquids as Efficient Reagents for the C−O Bond Cleavage of Lignin | Zendy

Thierry Marina | Zendy; Majira Amel | Zendy; Pégot Bruce | Zendy; Cezard Laurent | Zendy; Bourdreux Flavien | Zendy; Clément Gilles | Zendy; Perreau François | Zendy; BoutetMercey Stéphanie | Zendy; Diter Patrick | Zendy; VoThanh Giang | Zendy; Lapierre Catherine | Zendy; Ducrot PaulHenri | Zendy; Magnier Emmanuel | Zendy; Baumberger Stéphanie | Zendy; Cottyn Betty | Zendy

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Imidazolium‐Based Ionic Liquids as Efficient Reagents for the C−O Bond Cleavage of Lignin

Author(s) -

Thierry Marina,

Majira Amel,

Pégot Bruce,

Cezard Laurent,

Bourdreux Flavien,

Clément Gilles,

Perreau François,

BoutetMercey Stéphanie,

Diter Patrick,

VoThanh Giang,

Lapierre Catherine,

Ducrot PaulHenri,

Magnier Emmanuel,

Baumberger Stéphanie,

Cottyn Betty

Publication year - 2018

Publication title -

chemsuschem

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.412

H-Index - 157

eISSN - 1864-564X

pISSN - 1864-5631

DOI - 10.1002/cssc.201701668

Subject(s) - lignin , ionic liquid , depolymerization , chemistry , demethylation , organic chemistry , reagent , monomer , solvent , yield (engineering) , phenol , polymer , catalysis , materials science , biochemistry , gene expression , metallurgy , dna methylation , gene

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 31 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.

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