Keywords Lignin model compounds Guaiacyl lignin Syringyl lignin Bromination-EDXA technique Reactivity Softwood Hardwood A Comparison of the Bromination of Syringyl and Guaiacyl-Type Lignins
SummaryA study of lignin model compounds indicated that the reactivity of non-condensed guaiacyl, Condensed guaiacyl and syringyl nuclei tovvards bromine is different. In order to evaluate the overall reactivity of the guaiacyl and syringyl residues in lignin, two softwood and eight hardwood species, selected so äs to cover a ränge of methoxyl groups per phenylpropane unit (MeO/C 9 ) in their lignins, were treated with bromine and the extent of the bromination of the lignin was determined by elemental analysis. The results indicated that the overall reactivity of the syringyl lignin to bromine was 1.2 times higher than that of the guaiacyl lignin. This finding was in good agreement with the data from the brominated white birch tissue fractions of the middle lamella and secondary wall.
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