Abstract Heating of 1-phenyl-2-(phenylamino) ethanone in a water-ethanol solution of potassium carbonate gave rise to (Z)-1, 4-diphenyl-2-phenylamino-2-butene-1, 4-dione; it formed most probably by reaction of the initial aminoketone with its oxidation product, 1- phenyl-2-(phenylimino) ethanone.
