Add time:08/25/2019         Source:sciencedirect.com

When 1,5-dihydroxyanthraquinone (Anthrarufin) and 1,8-Dihydroxyanthraquinone (cas 117-10-2) (Chrysazin) were nitrated using a mixture of concentrated sulfuric and nitric acids in the presence of boric acid at 10–25° C, three major products formed in each reaction. The products were separated by low-pressure column chromatography and identified by 1H-NMR and mass spectrometric analyses in tandem. The products identified result from the mono-, di- and tetra-nitration of these dihydroxyanthraquinones.

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