Lec-3 preparation method of Amines|class 12th chemistry|chemistry by ashutosh sir|
Автор: PHYCHEM ACADEMY
Загружено: 2025-12-17
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preparation method of Amines|class 12th chemistry|chemistry by ashutosh sir
Preparation Methods of Amines
Amines can be prepared by several methods:
1. Hofmann Bromamide Reaction
*Reaction*: RCONH2 + Br2 + 4NaOH → RNH2 + Na2CO3 + 2NaBr + 2H2O
*Process*: Amides react with bromine in alkaline medium to form amines with one carbon less.
2. Gabriel Phthalimide Synthesis
Used for preparing primary amines.
Phthalimide reacts with R-X (alkyl halide) followed by hydrolysis.
3. Reduction of Nitro Compounds
*Reaction*: RNO2 + 6[H] → RNH2 + 2H2O
*Reducing agents*: H2/Ni, Fe/HCl, Sn/HCl, etc.
4. Alkylation of Ammonia
*Reaction*: RX + NH3 → RNH2 → R2NH → R3N
*Process*: Ammonia reacts with alkyl halides to give a mixture of amines.
5. Reduction of Nitriles
*Reaction*: RCN + 4[H]---------▶️⏩ RCH2NH2
*Reducing agents*: LiAlH4, Na/alcohol, etc.
Do you want a specific method explained further or examples?
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