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Previous work (1) has shown that potassium ferricyanide in basic solutions oxidizes a mixture of phenol and aminoantipyrine to a dye. This reaction appears to be analogous to the reactions of the p-diamines with phenols in which indophenols (2) are formed. If p-PDNHs is used to represent p-phenylenediamine and APNHi is used for aminoantipyrine the analogy of the reactions may be shown by the following equations:

In the course of investigating the structure of some indophenol-type dyes formed by the interaction of 4-aminoantipyrine with phenols, difficulty was experienced in isolating the hydrolytic products. These products, 4-aminoantipyrine and quinone, react with each other at once to form anils in the same manner as aniline and quinone react.

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