What reagents are used to convert nitrobenzene to aniline?

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This reaction involves the reduction of a nitro group ( $-\text{NO}_2$ ) to an amino group ( $-\text{NH}_2$ ). This is a common method for synthesizing anilines from nitrobenzenes.

Identify the functional groups.
The reactant is nitrobenzene, which has a nitro group ( $-\text{NO}_2$ ) attached to a benzene ring.
The product is aniline, which has an amino group ( $-\text{NH}_2$ ) attached to a benzene ring.
Determine the type of reaction.
The conversion of a nitro group to an amino group is a reduction reaction.
Select an appropriate reducing agent.
Several reducing agents can accomplish this transformation. Common methods include:
- Metal and acid: Using a metal like tin ( $\text{Sn}$ ), iron ( $\text{Fe}$ ), or zinc ( $\text{Zn}$ ) in the presence of a strong acid (e.g., $\text{HCl}$ ). This typically forms the anilinium salt, which is then neutralized with a base (e.g., $\text{NaOH}$ ) to yield the free amine.
- Catalytic hydrogenation: Using hydrogen gas ( $\text{H}_2$ ) with a metal catalyst such as palladium ( $\text{Pd}$ ), platinum ( $\text{Pt}$ ), or nickel ( $\text{Ni}$ ).
One of the most common reagents used for this conversion is tin and hydrochloric acid, followed by a base.

The reagents for the conversion of nitrobenzene to aniline are:
$\boxed{\text{1. Sn, HCl} \\ \text{2. NaOH}}$
Alternatively, catalytic hydrogenation can be used:
$\boxed{\text{H}_2, \text{Pd/C}}$

What reagents are used to convert nitrobenzene to aniline?

Answer

Step-by-step solution

Identify the functional groups.

Determine the type of reaction.

Select an appropriate reducing agent.

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