T. Kishimoto, Y. Sano
Delignification Mechanism during High-Boiling Solvent Pulping. Part 2. Homolysis of Guaiacylglycerol-?-Guaiacyl Ether
Summary
A phenolic ?-O-4 type lignin model compound, guaiacylglycerol-?-guaiacyl ether, was treated with
70 wt % aq 1,4-butanediol solution at 180°C to investigate the delignification mechanism under
high-boiling solvent (HBS) pulping conditions. Thirteen compounds including four monomers, six
dimers, two trimers and a tetramer were isolated from the reaction products. Most of these products
were generated by recombination of phenoxy radicals formed by homolysis of the ?-aryl
ether. The results suggest that phenolic ?-O-4 linkages in lignin are cleaved homolytically (radical
mechanism) via quinone methide intermediates under HBS pulping conditions.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 56, 11/2002
Pages: 623 - 631
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