The dye-sensitized photooxidation of some tri-and tetraazabenzopentalenes is reported. The pyrazolobenzotriazole 4 is converted to a mixture of 3-(l-benzotriazolyl)-and 3-(2- benzotriazolyl) propenals (7 and 8) in inert solvents, while in methanol the corresponding methoxy hydroperoxides 9 and 10 are formed. The products from 1, 2, 3-triazolo [1, 2-a] benzotriazole (5) are the diazabutadiene derivative 11 and cis, cis-mucononitrile; it is ...
![1,2,3-triazolo[1,2-a]benzotriazole Structure](https://image.chemsrc.com/caspic/014/10560-67-5.png)