Abstract Chemistry of Free Cyclic Vicinal Tricarbonyl Compounds ('1, 2, 3-Triones'). Part 3. Polar and Redox Reactions of 1, 2, 3-Triones with Enamines of Different Types–News on Oxonol Dyes, Radicals, and Biradicals The central C [DOUBLE BOND] O groups of cyclic 1, 2, 3-triones possess outstanding electrophilic (electron-pair-accepting) as well as oxidizing (one-electron-accepting) properties. Thus, 1, 2, 3-triones are chemically related to 1, 2- ...