Abstract
Alkali lignin of Eucalyptus regnans F.
Muell. has been treated with ethanol in the presence of hydrogen chloride to
yield ethanol alkali lignin. The reaction has been found to involve ethylation
of an acidic hydroxyl group, not acetalization of a carbonyl group.
From the analysis of derivatives of
ethanol alkali lignin, ethanol lignin, and alkali lignin, some inferences have
been drawn regarding the structure of protolignin.
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