Delignification mechanism during high-boiling solvent pulping -: Part 2.: Homolysis of guaiacylglycerol-β-guaiacyl ether

被引：36

作者：

Kishimoto, T ^{[1
]}

Sano, Y ^{[1
]}

机构：

[1] Hokkaido Univ, Grad Sch Agr, Div Appl Biosci, Res Grp Bioorgan Chem,Lab Wood Chem, Sapporo, Hokkaido 0608589, Japan

来源：

HOLZFORSCHUNG | 2002年 / 56卷 / 06期

关键词：

organosolv pulping; solvolysis; homolytic cleavage; reaction mechanism; beta-0-4 model compound; lignin;

D O I：

10.1515/HF.2002.095

中图分类号：

S7 [林业];

学科分类号：

0829 ; 0907 ;

摘要：

A phenolic beta-O-4 type lignin model compound, guaiacylglycerol-beta-guaiacyl ether, was treated with 70 wt % aq 1,4-butanediol solution at 180degreesC 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 beta-aryl ether. The results suggest that phenolic beta-O-4 linkages in lignin are cleaved homolytically (radical mechanism) via quinone methide intermediates under HBS pulping conditions.

引用

页码：623 / 631

页数：9

共 14 条

[1] A NEW SYNTHESIS OF MODEL COMPOUNDS FOR THE BETA-5 STRUCTURAL UNIT IN LIGNINS [J].