Questions about the diazotization reaction
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Under normal circumstances, when carrying out a diazotization reaction of aromatic primary amines with sodium nitrite and hydrochloric acid (or sulfuric acid), is it necessary to add the aromatic primary amine together with sodium nitrite and hydrochloric acid to the reaction vessel, or should sodium nitrite and hydrochloric acid (or sulfuric acid) be added first and then the aromatic primary amine? If the latter is correct, the nitrous acid formed first decomposes back at a certain temperature (due to its instability), whereas the nitrous acid produced in the former case reacts rapidly with aromatic primary amines through diazotization, thereby preventing the decomposition of the nitrous acid. Which approach is the correct one?
In the diazotization process, we first put the aromatic primary amine and sodium nitrite into the reaction vessel, and then add sodium nitrite slowly
In the diazotization process, we first put aromatic primary amines and hydrochloric acid into the reaction vessel, and then slowly add sodium nitrite