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Why is it difficult to prepare pure amin...

Why is it difficult to prepare pure amines by ammonolysis of alkyl halides?

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During ammonolysis of alkyl halides, the acid liberated during the reaction combines with the amine and forms amine salt. To liberate free amine from the amine salt, a base is needed. The base used is exceed of alcholic `NH_(3)` which serves both as a nucleophile as well as a base. For example.
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