Chapter 16.4, Problem 6PTS

(a)

Interpretation Introduction

Interpretation:

For the each given reactions, the products and the mechanism that explains the formation of each product are needed to be determined.

Concept introduction:

• Conjugated Dienes undergoes addition reactions with $\text{HBr}$ as similar to simple alkenes addition with $\text{HBr}$.
• The allylic carbocation is formed as an intermediate by the addition of proton in the $\text{HBr}$.
• The ${\text{Br}}^{-}$(nucleophilic) can attacks in either of the two resonance stabilized carbocation’s in the in the allylic intermediate. 
• Symmetrical diene like butadiene will produce only two products. Because the intermediates allylic carbocation formed are same.
• For the Butadiene derivatives, there are four carbons for addition of proton, but at C1 and C4 carbons only forms the allylic carbocation.

To determine: the products and the mechanism that explains the formation of each product for the given reaction.

(b)

Interpretation Introduction

Interpretation:

For the each given reactions, the products and the mechanism that explains the formation of each product are needed to be determined.

Concept introduction:

• Conjugated Dienes undergoes addition reactions with $\text{HBr}$ as similar to simple alkenes addition with $\text{HBr}$.
• The allylic carbocation is formed as an intermediate by the addition of proton in the $\text{HBr}$.
• The ${\text{Br}}^{-}$(nucleophilic) can attacks in either of the two resonance stabilized carbocation’s in the in the allylic intermediate. 
• Symmetrical diene like butadiene will produce only two products. Because the intermediates allylic carbocation formed are same.
• For the Butadiene derivatives, there are four carbons for addition of proton, but at C1 and C4 carbons only forms the allylic carbocation.

(c)

Interpretation Introduction

Interpretation:

For the each given reactions, the products and the mechanism that explains the formation of each product are needed to be determined.

Concept introduction:

• Conjugated Dienes undergoes addition reactions with $\text{HBr}$ as similar to simple alkenes addition with $\text{HBr}$.
• The allylic carbocation is formed as an intermediate by the addition of proton in the $\text{HBr}$.
• The ${\text{Br}}^{-}$ (nucleophilic) can attacks in either of the two resonance stabilized carbocation’s in the in the allylic intermediate. 
• Symmetrical diene like butadiene will produce only two products. Because the intermediates allylic carbocation formed are same.
• For the Butadiene derivatives, there are four carbons for addition of proton, but at C1 and C4 carbons only forms the allylic carbocation.

To determine: the products and the mechanism that explains the formation of each product for the given reaction.

(d)

Interpretation Introduction

Interpretation:

For the each given reactions, the products and the mechanism that explains the formation of each product are needed to be determined.

Concept introduction:

• Conjugated Dienes undergoes addition reactions with $\text{HBr}$ as similar to simple alkenes addition with $\text{HBr}$.
• The allylic carbocation is formed as an intermediate by the addition of proton in the $\text{HBr}$.
• The ${\text{Br}}^{-}$ (nucleophilic) can attacks in either of the two resonance stabilized carbocation’s in the in the allylic intermediate. 
• Symmetrical diene like butadiene will produce only two products. Because the intermediates allylic carbocation formed are same.
• For the Butadiene derivatives, there are four carbons for addition of proton, but at C1 and C4 carbons only forms the allylic carbocation.

To determine: the products and the mechanism that explains the formation of each product for the given reaction.

(e)

Interpretation Introduction

Interpretation:

For the each given reactions, the products and the mechanism that explains the formation of each product are needed to be determined.

Concept introduction:

• Conjugated Dienes undergoes addition reactions with $\text{HBr}$ as similar to simple alkenes addition with $\text{HBr}$.
• The allylic carbocation is formed as an intermediate by the addition of proton in the $\text{HBr}$.
• The ${\text{Br}}^{-}$ (nucleophilic) can attacks in either of the two resonance stabilized carbocation’s in the in the allylic intermediate. 
• Symmetrical diene like butadiene will produce only two products. Because the intermediates allylic carbocation formed are same.
• For the Butadiene derivatives, there are four carbons for addition of proton, but at C1 and C4 carbons only forms the allylic carbocation.

To determine: the products and the mechanism that explains the formation of each product for the given reaction.

(f)

Interpretation Introduction

Interpretation:

For the each given reactions, the products and the mechanism that explains the formation of each product are needed to be determined.

Concept introduction:

• Conjugated Dienes undergoes addition reactions with $\text{HBr}$ as similar to simple alkenes addition with $\text{HBr}$.
• The allylic carbocation is formed as an intermediate by the addition of proton in the $\text{HBr}$.
• The ${\text{Br}}^{-}$ (nucleophilic) can attacks in either of the two resonance stabilized carbocation’s in the in the allylic intermediate. 
• Symmetrical diene like butadiene will produce only two products. Because the intermediates allylic carbocation formed are same.
• For the Butadiene derivatives, there are four carbons for addition of proton, but at C1 and C4 carbons only forms the allylic carbocation.

To determine: the products and the mechanism that explains the formation of each product for the given reaction.