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The rapid and convenient construction ofbenzo-fused cyclic compounds has attracted significant attention due to their wide applications in various fields.As important building blocks and organic synthons,aryltriazene compounds can be applied in the synthesis of a variety of heterocycles and carbocycles.With promotion by Lewis or Brφnsted acids,aryltriazenes are readily transformed into reactive aryl cations which can undergo intramolecular cyclization to form diverse benzo-fused cyclic compounds.