Pyrimidines. Part 69. The Dimroth Rearrangement of 6-Aminouracil Derivtives.-Treatment of the uracils (I) with potassium hydroxide results in the formation of the rearranged compounds (II), together with a ring opening product (IIIc). The outcome of the reaction is discussed on the basis of a Dimroth rearrangement of the starting uracils (I). -(HIROTA, K.; NI, P.-Z.; SUZUKI, A.; TAKASU, H.; KITADE, Y.; MAKI, Y.; Chem.