Question

Give mechanism for the Hofmann degradation reaction.

   Give mechanism for the Hofmann degradation reaction.

Organic Chemistry

Organic Chemistry

Bhupinder Mehta,… 1st Edition

Chapter 22, Problem 8

Instant Answer

Solved by Expert Zubair Abdulla

09/05/2020

Step 1

The reaction involves oxidation and rearrangement of the amide using halogen (chlorine or bromine) and a strong base (usually aqueous sodium or potassium hydroxide). The mechanism proceeds as follows: Show more…

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Key Concepts

Isocyanate Intermediate

The migration step leads to the formation of an isocyanate intermediate. This intermediate is a key species in the mechanism because it undergoes further reaction with water. The presence of the isocyanate is indicative of the successful rearrangement and is central to the eventual conversion into the amine product.

1,2-Migration (Rearrangement Step)

Following the formation of the N-haloamide, the reaction undergoes a 1,2-migration where an alkyl or aryl group adjacent to the carbonyl migrates from the carbon to the nitrogen. This migration is accompanied by the elimination of a halide ion, and it represents the core rearrangement event that defines the Hofmann degradation mechanism.

Hydrolysis

In the final step of the Hofmann rearrangement, the isocyanate intermediate reacts with water under the reaction conditions to form a carbamic acid, which quickly decomposes to yield an amine with one fewer carbon atom than the starting amide. This hydrolysis step is critical as it completes the transformation, making the overall process useful for the synthesis of substituted amines.

Hofmann Rearrangement

The Hofmann rearrangement is a chemical reaction in which an amide is converted into an amine with one fewer carbon atom. This key transformation is noteworthy in organic synthesis as it effectively removes the carbonyl carbon, enabling the production of amines from easily accessible amides under relatively mild conditions.

N-Haloamide Formation

In the mechanism of the Hofmann rearrangement, the initial step involves the halogenation of the amide nitrogen, producing an N-haloamide. This intermediate is formed when a halogen, typically bromine, reacts with the deprotonated amide under basic conditions. The formation of the N-haloamide is crucial as it sets the stage for the subsequent rearrangement step.

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