Chapter 15, Problem 15.66AP

Interpretation Introduction

(a)

Interpretation:

The relationship between the products of $1,2-$ and $1,4-$ addition in the reaction, $\left(E\right)-{\text{H}}_{\text{2}}\text{C}=\text{CH}-\text{CH}=\text{CH}-{\text{CH}}_{\text{3}}+\text{ HCl}\to$ is to be stated.

Concept introduction:

Conjugated dienes give two types of addition products-$1,2-$ addition and $1,4-$ addition products. The addition product $1,2$ indicates the addition of hydrogen halide at adjacent carbon and also, it is the major product. The addition product $1,4$ indicates the addition of hydrogen halides to carbons that have a $1,4$ relationship and also, it is the minor product.

Interpretation Introduction

(b)

Interpretation:

The change in the relationship between the products of $1,2-$ and $1,4-$ addition in the reaction, $\left(E\right)-{\text{H}}_{\text{2}}\text{C}=\text{CH}-\text{CH}=\text{CH}-{\text{CH}}_{\text{3}}+\text{ DCl}\to$ by using $\text{DCl}$ is to be stated.

Concept introduction:

Conjugated dienes give two types of addition products-$1,2-$ addition and $1,4-$ addition products. The addition product $1,2$ indicates the addition of hydrogen halide at adjacent carbon and also, it is the major product. The addition product $1,4$ indicates the addition of hydrogen halides to carbons that have a $1,4$ relationship and also, it is the minor product.

Interpretation Introduction

(c)

Interpretation:

The product that is obtained by the reaction of $\left(E\right)-\text{penta}-1,3-\text{diene}$ and $\text{DCl}$ which is kinetically controlled is to be predicted.

Concept introduction:

The reduction of an aldehyde or ketone in the presence of a hydride like ${\text{LiAlH}}_{\text{4}}$ and ${\text{NaBH}}_{\text{4}}$ forms the corresponding alcohol. The reduction of an aldehyde forms a primary alcohol and the reduction of a ketone forms a secondary alcohol.