Abstract
Two coloring matters produced in the color reaction of acetone with excessive 1, 3, 5-trinitrobenzene in an alkaline medium were separated in crystalline forms and one of them was determined as the Meisenheimer type complex of acetone (I). The other was a new type complex (II) and was characterized as a sodium salt of the anion group shown in Chart 1. Spectrophotometric studies of I, II and the color reaction showed that I formed in the early stage of the reaction and then changed to II with time in the alkaline medium in the presence of excessive trinitrobenzene. In addition, a reason for increase of the color intensity in the improved procedures of the detection and determination of acetone was clarified by studying spectrophotometrically some behaviors of I and II.
