The Analysis of Smoke Dyes. II. The Determination of 1-Amino-4-Hydroxyanthraquinone in 1,4-Diaminoanthraquinone.

摘要

Leuco 1-amino-4-hydroxyanthraquinone has been identified as an impurity in 1,4-diamino-2,3-dihydroanthraquinone. Identification of this impurity was made by visible and infrared spectroscopy and thin-layer chromatography. The amount of the impurity 1-amino-4-hydroxyanthraquinone can be quantitatively determined in the presence of 1,4-diaminoanthraquinone by converting the 1-amino-4-hydroxyanthraquinone to the anion by reaction with 0.03M KOH in ethanol. Anion formation is accompanied by a bathochromic shift in the visible region to 603nm. (Modified author abstract)