Mechanism for the base-catalysed rearrangement for the given α , β − unsaturated carbonyl compound has to be proposed. Concept introduction: The carbon which is adjacent to the carbonyl group is known as α- carbon, followed next by β- carbon and γ- carbon. The α,β- unsaturated carbonyl compounds are a type of carbonyl compounds where there is a double bond between the α and β- carbon. The β , γ − unsaturated carbonyl compound are those with a double bond between the β and γ- carbon. The α , β - unsaturated carbonyl compounds are most stable than the β,γ- unsaturated carbonyl compound and rearrangement takes place in presence of either an acid or a base.

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Chapter 13, Problem 35P

(a)

Interpretation Introduction

Interpretation:

Mechanism for the base-catalysed rearrangement for the given α,β− unsaturated carbonyl compound has to be proposed.

Concept introduction:

The carbon which is adjacent to the carbonyl group is known as α- carbon, followed next by β- carbon and γ- carbon.

The α,β- unsaturated carbonyl compounds are a type of carbonyl compounds where there is a double bond between the α and β- carbon.

The β,γ− unsaturated carbonyl compound are those with a double bond between the β and γ- carbon.

The α,β- unsaturated carbonyl compounds are most stable than the β,γ- unsaturated carbonyl compound and rearrangement takes place in presence of either an acid or a base.

(b)

Interpretation Introduction

Interpretation:

Mechanism for the acid-catalysed rearrangement for the giveb α,β− unsaturated carbonyl compound has to be proposed.

Concept introduction:

The carbon which is adjacent to the carbonyl group is known as α- carbon, followed next by β- carbon and γ- carbon.

The α,β- unsaturated carbonyl compounds are a type of carbonyl compounds where there is a double bond between the α and β- carbon.

The α,β− unsaturated carbonyl compound are those with a double bond between the β and γ- carbon.

The α,β- unsaturated carbonyl compounds are most stable than the

β,γ- unsaturated carbonyl compounds and rearrangement takes place in presence of either an acid or a base.

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