The method of making iodobenzene from aniline
If you want to make iodobenzene from aniline, the method is as follows:

First take an appropriate amount of aniline and place it in a clean container. Add an appropriate amount of acid to make aniline into a salt. This step can increase its solubility and reactivity. Then, slowly add a solution of sodium nitrite and control its temperature within a certain range to prevent side reactions. In this process, aniline reacts with sodium nitrite to form a diazonium salt.

When the diazonium salt is formed, prepare a solution containing iodine ions, such as a solution of potassium iodide. Pour the solution slowly into the container containing the diazonium salt and stir at the same time. The diazonium salt reacts with the iodine ion, and the diazonium group is replaced by the iodine atom to obtain iodobenzene.

After the reaction is completed, the impurities in the reaction system can be removed by appropriate separation and purification methods, such as distillation, extraction, etc., to obtain pure iodobenzene.

This process requires fine temperature control and quantity control to ensure a smooth reaction and a pure product. Good use of this method can cause the conversion of aniline to iodobenzene.