Question

Which of the following reactions is appropriate for converting acetamide to methanamine?

• A. Carbylamine reaction
• B. Hoffmann hypobromamide reaction
• C. Stephens reaction
• D. Gabriels phthalimide synthesis

Answer 1

The Correct Option is B

 To convert acetamide to methanamine, we can use the Hoffmann hypobromamide reaction. This reaction involves the conversion of an amide to an amine with one fewer carbon atom, a process known as a degradative amination.

The steps of the Hoffmann hypobromamide reaction are as follows:

1. Start with acetamide as the substrate:
2. React acetamide with bromine and a base, typically sodium hydroxide (NaOH):
3. The bromine (Br₂) reacts with the amide under basic conditions to form an intermediate, which rearranges to eliminate CO₂, resulting in the formation of methanamine (methylamine):

Explanation of Options:

• Carbylamine reaction: This is used for converting primary amines into isocyanides (carbylamines), not applicable here.
• Hoffmann hypobromamide reaction: Correct method for converting acetamide to methanamine as it degrades the amide.
• Stephens reaction: Typically converts nitroso compounds into primary amines, which is not directly suitable for amides.
• Gabriel’s phthalimide synthesis: Used to synthesize primary amines from alkyl halides, not from amides.

Therefore, the appropriate reaction for converting acetamide to methanamine is the Hoffmann hypobromamide reaction.