D. O. Ukponmwan, H. Freeman
1990
Citations
0
Influential Citations
2
Citations
Journal
Dyes and Pigments
Abstract
Abstract When 1,5-dihydroxyanthraquinone (Anthrarufin) and 1,8-dihydroxyanthraquinone (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 1 H-NMR and mass spectrometric analyses in tandem. The products identified result from the mono-, di- and tetra-nitration of these dihydroxyanthraquinones.