期刊
JOURNAL OF WOOD SCIENCE
卷 53, 期 3, 页码 268-271出版社
SPRINGER TOKYO
DOI: 10.1007/s10086-006-0839-7
关键词
lignin pyrolysis; model compound; beta-ether cleavage; effect of hydroxyl group
Effects of side chain hydroxyl groups on pyrolytic beta-ether cleavage of phenolic model dimers were studied with various deoxygenated dimers under pyrolysis conditions of N-2/400 degrees C/1 min. Although phenolic dimer with hydroxyl groups at the C-alpha- and C-gamma(-) positions was much more reactive than the corresponding nonphenolic type, deoxygenation at the C-gamma-position substantially reduced the reactivity up to the level of the nonphenolic type. These results are discussed with the cleavage mechanism via quinone methide intermediate formation, which is activated through intramolecular hydrogen bonds between C-alpha- and C-gamma- hydroxyl groups.
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