REACTIVITY OF LIGNIN DIPHENYLMETHANE MODEL DIMERS UNDER MILD ALKALI-O-2 CONDITIONS

Authors
XU H LAI YZ
Citation
H. Xu et Yz. Lai, REACTIVITY OF LIGNIN DIPHENYLMETHANE MODEL DIMERS UNDER MILD ALKALI-O-2 CONDITIONS, Journal of wood chemistry and technology, 17(3), 1997, pp. 223-234
Citations number
20
Categorie Soggetti
Materials Science, Paper & Wood
Journal title
Journal of wood chemistry and technology → ACNP
ISSN journal
02773813
Volume
17
Issue
3
Year of publication
1997
Pages
223 - 234
Database
ISI
SICI code
0277-3813(1997)17:3<223:ROLDMD>2.0.ZU;2-2
Abstract
A series of phenolic lignin-model dimers of the guaiacyl diphenylmetha ne (DPM) type has been shown to be quite reactive under mild alkali-O- 2, conditions (0.5 N NaOH, 55 degrees C) giving significant amounts of monomeric products. The reactivity of these dimers varies significant ly and decreases in the order of alpha-5, 5,5', alpha-6, and alpha-1 t ypes. Interestingly, the oxidative cleavages of these DPM units, excep t the alpha-6 type, all gave the benzyl alcohol products e.g. vanillyl alcohol.