Liquefaction Mechanism of Lignin in the Presence of Phenol at Elevated Temperature without Catalysts. Studies on ß-O-4 Lignin Model Compound. I. Structural Characterization of the Reaction Products

摘要: Guaiacylglycerol-β-guaiacyl ether (GG) was used as a starting material to study the liquefaction mechanism of lignin in presence phenol under elevated temperature without catalysts. The products GG obtained were analyzed by means GPC and GC-MS. It found that first produced relatively low molecular weight intermediates, followed gradual conversion these reaction intermediates polymeric products. After isolation liquid chromatographic method, 28 main identified with help MS NMR. they are mainly composed guaiacol various phenolated coniferyl alcohol, such diphenylpropenes, phenylcoumaranes. phenylcoumarones phenylflavanes. detailed NMR data compounds their assignments demonstrated this article.