Abstract
Small amounts of ethylenic groups are present in in situ lignin mainly as components of unattached cinnamaldehyde and cinnamyl alcohol end groups (I and II, respectively, Table 7.3.1) (Lai and Sarkanen 1971). Additionally, the presence of carbonyl-conjugated ethylenic groups as elements of p-quinonoid (Pew and Connors 1971) and o-quinonoid (Harkin 1966) ring systems has been proposed.
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© 1992 Springer-Verlag Berlin Heidelberg
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Dence, C.W. (1992). Determination of Ethylenic Groups. In: Lin, S.Y., Dence, C.W. (eds) Methods in Lignin Chemistry. Springer Series in Wood Science. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74065-7_29
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DOI: https://doi.org/10.1007/978-3-642-74065-7_29
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