Chapter 22, Problem 22.49P

Interpretation Introduction

(a)

Interpretation:

The curved-arrow mechanism for the reaction of $\text{2-oxocyclohexanal}$ with $\text{but-3-en-2-one}$ is to be stated. The intermediate $A$ has to be identified.

Concept introduction:

Michael addition reactions are those reactions in which an enolate ion undergoes cyclo-addition reactions with $\text{α,β-}$ unsaturated carbonyl compounds. This reaction occurs in the presence of a catalytic base. Aldol condensation reactions are those reactions in which enolate ions reacts with carbonyl compounds to produce $\text{β-}$ hydroxyl aldehydes or $\text{β-}$ hydroxyl ketones.

Interpretation Introduction

(b)

Interpretation:

The curved-arrow mechanism for the reaction of diethyl malonate with $\text{but-3-en-2-one}$ is to be stated. The intermediate has to be identified.

Concept introduction:

Michael addition reactions are those reactions in which an enolate ion undergoes cyclo-addition reactions with $\text{α},\text{β}-$ unsaturated carbonyl compounds. This reaction occurs in the presence of a catalytic base. Aldol condensation reactions are those reactions in which enolate ions reacts with carbonyl compounds to produce $\text{β}-$ hydroxyl aldehydes or $\text{β}-$ hydroxyl ketones.