Benzanellated Azoles Reactions and Synthesis

There is only one way in which a benzene ring can be fnsed to each of the three 1,3-azoles, generating IH-benzimidazole, benzoxazole and benzothiazole. Indazole is the only possibility for the analogons fusion to a pyrazole it exists as a H tautomer - the 2/f-tautomer cannot be detected, though 2-substituted 2//-indazoles are known. Two distinct isomers each are possible for the other two benzo-fused 1,2-azoles  

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