Synthesis of formazan-3-yltriazolium salts: A new class of formazan and crown-formazan derivatives of expected useful applications

Article abstract of DOI:10.1016/S0040-4020(97)00508-5

The 1-aza-2-azoniaallene salts 3 react with 3-cyanoformazns 4-6 to give the corresponding 5-(1,5-diarylformazan-3-yl)triazolium salts 7-9 or the rearrangement derivatives 10-12 or the oxidation products 13-15. Reaction of 3a,d with the crown cyanoformazan