Question

If I have bromobenzene and, I nitrate it, in excess, at the para position; does the ring now direct the next nitration at the meta position because of the para nitro group? Or is the bromo still directing the next nitration to the ortho position? Either way it would end up in the same spot but what directs the additional substituents? The most recent addition or the original substituent?

Answer 1

In this case , both -NO2 and -Br are supporting the substitution because both substituents are supporting the substitution at same position.

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