Imidazolium-Based Ionic Liquids as Efficient Reagents for the C−O Bond Cleavage of Lignin
作者:Marina Thierry、Amel Majira、Bruce Pégot、Laurent Cezard、Flavien Bourdreux、Gilles Clément、François Perreau、Stéphanie Boutet-Mercey、Patrick Diter、Giang Vo-Thanh、Catherine Lapierre、Paul-Henri Ducrot、Emmanuel Magnier、Stéphanie Baumberger、Betty Cottyn
DOI:10.1002/cssc.201701668
日期:2018.1.23
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
通过使用纯木质素模型单体和二聚体,以及来自杨树,桔梗和玉米的二恶烷分离的木质素,对离子液体(ILs)中木质素的脱甲基化进行了研究。比较了不同的甲基咪唑鎓离子液体,并对样品进行了两种不同的加热处理:微波辐射和在密封管中进行常规加热。31评估了转化率和该处理对木质素结构的影响。P NMR光谱,尺寸排阻色谱和硫代酸解。酸性甲基咪唑鎓IL [HMIM] Br被证明是用于木质素脱甲基和解聚的溶剂和试剂的有效组合。相对温和的反应条件,清洁的操作流程以及重用IL的能力使所描述的程序成为一种有吸引力的绿色方法,可以将木质素转化为富含酚的木质素低聚物。