Nitrosyl Formation

Question

Formation of nitrosyl derivative (green coloration) with secondary amine indicates:

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1. **Nitrous Acid Tool**: $HNO_2$ reacts differently with different classes of amines.
2. **Primary ($1^\circ$)**: Form diazonium salts (evolve $N_2$ for aliphatic, stable for aromatic).
3. **Secondary ($2^\circ$)**: React to form **$N$-nitrosamines**.
4. **Observation**: These $N$-nitroso compounds are typically **yellow oily liquids** that can exhibit green or yellowish-green coloration upon further chemical treatment (Libbermann's Nitroso Test).
5. **Diagnostic Conclusion**: This characteristic oily derivative confirms the presence of a **secondary amine**.

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Nitrosyl Formation

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