AERIAL OXIDATION OF SOME 2-PYRIDYL KETONE HYDRAZONES CATALYZED BY CU2-PROPERTIES OF REACTION-PRODUCTS( PHYSICAL)

Some 2-pyridyl ketone hydrazones were subjected to aerial oxidation ca talyzed by Cu2+. The oxidation product of di-2-pyridyl ketone hydrazon e had the structure of a derivative of [1,2,3]-triazolo[1,5-a]pyridine , and this structure is different from that previously proposed by oth er investigators. The fluorescence spectra of the oxidation products w ere measured in solutions of a wide pH range. In contrast to the oxida tion products of other 2-pyridyl ketone hydrazones, that of di-2-pyrid yl ketone hydrazone showed very strong fluorescence in acidic media. T he characteristic nature of this compound was also apparent in the ult raviolet spectrum. The generation of hydroxyl radical was demonstrated in the aerial oxidation of di-2-pyridyl ketone hydrazone catalyzed by Cu2+, suggesting the formation of hydrogen peroxide as another oxidat ion product.