质谱、红外和核磁研究木质素模型物在Co-salen仿酶体系中的降解反应

摘要

根据GC-MS、FT-IR和~(13)C-NMR对降解产物与结构变化的分析,可得出紫丁香基木质素模型物在Co-salen仿酶反应体系中的降解机理.质谱、红外光谱和核磁检测结果表明,反应过程中,木质素模型物β-O-4、C_α-Ar、C_α-C_β连接断裂,苯环开环,同时发生酚羟基醚化和甲氧基脱甲基反应,产生4-羟基-3,5-二甲氧基苯乙酮、4-羟基-3,5-二甲氧基苯甲醛、4-羟基-3,5-二甲氧基苯甲酸、3-羟基-4,5-二甲氧基苯甲酸.%Mechanism of syringyl lignin model compound degradation in Co-salen biomimetic system was obtained based on the analysis of products and structural changes by GC-MS,FTIR and I3C-NMR. The results showed the linkages of β-O-4,C_α-Ar,C_α-C_β and O-CH_3 were cleaved,aryl-ring was opened and Ph-OH was etherified,producing 4-hydroxy-3,5-dimethoxyphenyl ethanone,4-hydroxy-3,5-dimethoxy benzaldehyde,4-hydroxy-3,5-dimethoxybenzoic acid,3-hydroxy-4,5-dimethoxybenzoic acid.