From Blatter Radical to 7‑Substituted 1,3-Diphenyl-1,4-dihydrothiazolo[5′,4′:4,5]benzo[1,2‑e][1,2,4]triazin-4-yls: Toward Multifunctional Materials

A Blatter radical is oxidized to benzotriazin-7(H)-one which after amination and subsequent acyl- and aroylation gives N-(benzotriazin-6-yl)carboxamides that undergo ring closure with P2S5 to afford the corresponding thiazolo[5′,4′:4,5]benzo[1,2-e][1,2,4]triazin-4-yls. These highly delocalized radicals are air stable and show good reversible electrochemical behavior.