Abstract
ABSORPTION spectra and colour reactions indicate the presence in lignins of p-hydroxyphenylketone groups (I; L represents the rest of the lignin molecule)1 and 4-0-substituted cinnamaldehyde groups (II)2. 
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References
Goldschmid, O., J. Amer. Chem. Soc., 75, 3780 (1953).
Pew, J. C., J. Amer. Chem. Soc., 73, 1678 (1951); 74, 2850 (1952). Adler, E., and Elmer, L., Acta Chem. Scand., 2, 839 (1948).
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SMITH, D. Contribution of Residues containing Carbonyl to the Ultra-Violet Absorption of Lignins. Nature 176, 927–928 (1955). https://doi.org/10.1038/176927a0
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DOI: https://doi.org/10.1038/176927a0
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