Arenes and Hetarenes Activated by the Nitro Group

Aromatization of the o -adducts is a crucial step in a vast majority of the Sn reactions, although sometimes it requires rather unusual conditions. It has been shown that aromatization of the o -adducts derived from 6-nitro-l,2,4-triazolo 

This method has been exploited for the synthesis of a variety of condensed heterocyclic systems through awto-aromatization of the intermediate o -adducts derived from the reactions of nitro-substituted azoloazines with nucleophiles [104, 105]. 

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