Abstract
IT is now generally accepted that the skeletal part of humic acids consists of heteropolycondensates of various aromatic nuclei. This concept, however, has been deduced rather indirectly from physico-chemical data such as X-ray analysis, and benzene seems to be the sole aromatic ring identified by the method of organic chemistry1. Recently we found anthraquinone in the decarboxylation products of the water-soluble acid fraction obtained by the alkaline permanganate oxidation of humic acids.
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References
Flaig, W., Landw. Forsch., 6 Sonderheft, 94 (1955).
Kumada, K., Soil and Plant Food, Japan, 1, 29 (1955).
Montgomery, R. S., and Holly, E. D., Fuel, 35, 49, 60 (1956).
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KUMADA, K., SUZUKI, A. & AIZAWA, K. Isolation of Anthraquinone from Humus. Nature 191, 415–416 (1961). https://doi.org/10.1038/191415b0
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DOI: https://doi.org/10.1038/191415b0
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