Reactions with electrophiles except nitrous acid

2 Reactions with electrophiles (except nitrous acid) 

In still other cases, the product of reaction of an electrophile with an aminoazole is from electrophilic attack at a ring carbon. This is electrophilic substitution and is the general result of nitration and halogenation (see Section 3.4.1.4). In such cases, reactions at both cyclic nitrogen and at an amino group are reversible. 

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Reactions with electrophiles except nitrous acid)... 

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