Summary
Synthetic Na-propioguajacon-α-sulfonate looses its sulfo-group when treated with an excess of bromine. Ligninsulfonic acid looses only 50% of its sulphur, a brominated ligninsulfonic acid being probably formed as a by-product.
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References
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Kratz, K., Bleckmann, C. Über die Bromierung der Ligninsulfosäure und deren Modellsubstanzen. Experientia 2, 24 (1946). https://doi.org/10.1007/BF02154704
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DOI: https://doi.org/10.1007/BF02154704