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 ligninmodelcompounds, 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
Chemical conversion of β-O-4 lignin linkage models through Cu-catalyzed aerobic amide bond formation
作者:Jian Zhang、Yu Liu、Shunsuke Chiba、Teck-Peng Loh
DOI:10.1039/c3cc46912c
日期:——
Methods for conversion of the lignin β-O-4 models into amide derivatives and phenols have been developed, which is achieved via chemo-selective oxidation of the secondary benzylic alcohol and subsequent Cu-catalyzed aerobic amide bond formation.
Toward the oxidative deconstruction of lignin: oxidation of β-1 and β-5 linkages
作者:Zhen Fang、Mark S. Meier
DOI:10.1039/c8ob00409a
日期:——
reports on methods for the oxidativecleavage of β-O-4 linkages in lignin model compounds, but relatively few reports of how those methods affect other linkages that are present in lignin. We have investigated the effect of several of these oxidation methods on the β-1 and the β-5 lignin linkages, using four β-1 and β-5 model compounds. We observed that direct oxidativecleavage of C–C bonds occurs in