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You are trying to make a para compound, so the trick here is to recognize that bromine is an ortho-para director (albeit a weak one) and nitro is a meta director. Therefore, you want to add the bromine first and then the nitro. Doing the reaction in reverse order will result in the meta product. Your reaction pathway is:

1) Benzene + Br2 + FeBr3 => Bromobenzene

2) Bromobenzene + HNO3 + H2SO4 (catalytic) => 1,2 bromonitrobenzene + 1,4 bromonitrobenzene

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12y ago
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5mo ago

Benzene can be converted into 4-bromonitrobenzene by first nitration with nitric acid to form nitrobenzene, followed by bromination with bromine or a brominating agent such as N-bromosuccinimide (NBS) to introduce the bromine at the desired position. The final product is 4-bromonitrobenzene. Note: These reactions require careful handling and appropriate safety precautions due to the reactive nature of the reagents involved.

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Q: How to convert benzene to 4-bromonitrobenzene?
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