Ozonolysis of 3-Methyl-1-phenyl-4-phenylazo-5-pyrazolone

Article abstract of DOI:10.1246/bcsj.58.2829

In chlorinated solvents, 3-methyl-1-phenyl-4-phenylazo-5-pyrazolone (1) easily reacts with ozone to give benzene (2), phenol (3), chlorobenzene (4), o-chlorophenol (5), biphenyl (6), and 3-methyl-1-phenyl-2-pyrazoline-4,5-dione (7).The formation of these products is explained by an electrophilic ozone attack on the hydrazone tautomer 1'.