Nature and Kinetic Analysis of Carbon−Carbon Bond Fragmentation Reactions of Cation Radicals Derived from SET-Oxidation of Lignin Model Compounds
作者:Dae Won Cho、Ramakrishnan Parthasarathi、Adam S. Pimentel、Gabriel D. Maestas、Hea Jung Park、Ung Chan Yoon、Debra Dunaway-Mariano、S. Gnanakaran、Paul Langan、Patrick S. Mariano
DOI:10.1021/jo1012509
日期:2010.10.1
oxidative cleavage reactions of diastereomers of dimeric lignin model compounds, which are models of the major types of structural units found in the lignin backbone, were examined. Cation radicals of these substances were generated by using SET-sensitized photochemical and Ce(IV) and lignin peroxidase promoted oxidative processes, and the nature and kinetics of their C−C bond cleavage reactions were determined
检查了二聚木质素模型化合物的非对映异构体的氧化裂解反应的特征,该化合物是木质素骨架中主要结构单元的模型。这些物质的阳离子自由基是通过SET增感光化学和Ce(IV)和木质素过氧化物酶促进的氧化过程生成的,并确定了它们的C-C键断裂反应的性质和动力学。结果表明,1,2-二芳基-(β-1)和1-芳基-2-芳氧基-(β-O-4)propan-1的阳离子自由基C1-C2键裂解反应速率存在显着差异。木质素中发现的,3-二醇结构单元。具体而言,在所有条件下,β-1模型的阳离子自由基的C1-C2键断裂反应都比β-O-4对应物的阳离子断裂更快。