Hoffmann Bromamide Degradation Reaction
Preparation of primary amines with one carbon atom less than the parent amide by treating an amide with bromine in an aqueous or ethanolic solution of sodium hydroxide.
What is Hoffmann Bromamide Degradation Reaction?
An amide where the carbonyl carbon is bonded to one alkyl or aryl group and two hydrogen atoms (R-CONH₂).
Key formula / rule: General Reaction
Key points
- Understand the mechanism of the Hoffmann bromamide degradation reaction.
- Predict the product of the reaction given the starting amide.
- Recognize the synthetic utility of this reaction for preparing primary amines.
- Differentiate it from other amine synthesis methods.
Common exam trap
Confusing the number of carbon atoms in the product amine (forgetting one is lost).
Definitions
- Term
Primary Amide
- Meaning
An amide where the carbonyl carbon is bonded to one alkyl or aryl group and two hydrogen atoms (R-CONH₂).
- Term
Degradation Reaction
- Meaning
A chemical reaction in which a molecule is broken down into smaller fragments, often involving the loss of atoms or functional groups.
Learning objectives
Understand the mechanism of the Hoffmann bromamide degradation reaction.
Predict the product of the reaction given the starting amide.
Recognize the synthetic utility of this reaction for preparing primary amines.
Differentiate it from other amine synthesis methods.
Formulae
- Name
General Reaction
- Note
Stoichiometry shown for complete reaction.
- Expression
R-CONH₂ + Br₂ + 4NaOH → R-NH₂ + Na₂CO₃ + 2NaBr + 2H₂O
Prerequisites
Understanding of amide structure and reactivity.
Knowledge of basic organic reaction mechanisms (nucleophilic attack, elimination, rearrangement).
Familiarity with strong bases and halogens.
Common mistakes
Confusing the number of carbon atoms in the product amine (forgetting one is lost).
Using insufficient base or bromine.
Incorrectly identifying the migrating group.
Expecting a secondary or tertiary amine as the product.
Keywords
Hoffmann Bromamide Degradation
Primary Amine Synthesis
Organic Reaction
Amide Conversion
Rearrangement Reaction
Bromine
Sodium Hydroxide
NEET Chemistry
Practice preview
When benzamide is treated with bromine in aqueous sodium hydroxide, the product formed is:…
medium
Which of the following amides will yield propylamine upon Hoffmann bromamide degradation?…
medium
The Hoffmann bromamide reaction is a method for the preparation of:…
easy