Chapter 13, Problem 35P

(a)

Interpretation Introduction

Interpretation:

Mechanism for the base-catalysed rearrangement for the given $\alpha ,\beta -$ unsaturated carbonyl compound has to be proposed.

Concept introduction:

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

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

The $\beta ,\gamma -$ unsaturated carbonyl compound are those with a double bond between the $\text{β}$ and $\text{γ-}$ carbon.

The $\alpha ,\beta \text{-}$ unsaturated carbonyl compounds are most stable than the $\text{β,γ-}$ 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 $\alpha ,\beta -$ unsaturated carbonyl compound has to be proposed.

Concept introduction:

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

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

The $\alpha ,\beta -$ unsaturated carbonyl compound are those with a double bond between the $\text{β}$ and $\text{γ-}$ carbon.

The $\text{α,β-}$ unsaturated carbonyl compounds are most stable than the

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