Chapter 7, Problem 62PP

(a)

Interpretation Introduction

Interpretation:

The stereochemical product should be drawn and identified for the given $E2$ elimination reaction.

Concept Introduction:

Elimination Reaction: It is just reverse reaction of addition where substituent from the given molecule is removed via $E1$ (the reaction depends only on the substrate involved in the reaction) or $E2$ (the reaction depends on both of the substituents in the reaction) mechanism.

$E2$Elimination reaction: $E2$ elimination occurs in a compound when the leaving group is antiperiplaner to the proton in presence of strong base. If the base is bulky in nature, least substituted alkene is favorable and the base is not bulky and stronger in nature, most substituted alkene is the favorable product.

For E2 elimination reaction, proton should be present at $\text{β}$ position to the leaving group in antiperiplaner way.

Zaitsev’s Rule: It is elimination reaction in which the formation of olefin on most hindered or highly substituted position

(b)

Interpretation Introduction

Interpretation:

The stereochemical product should be drawn and identified for the given $E2$ elimination reaction.

Concept Introduction:

Elimination Reaction: It is just reverse reaction of addition where substituent from the given molecule is removed via $E1$ (the reaction depends only on the substrate involved in the reaction) or $E2$ (the reaction depends on both of the substituents in the reaction) mechanism.

$E2$Elimination reaction: $E2$ elimination occurs in a compound when the leaving group is antiperiplaner to the proton in presence of strong base. If the base is bulky in nature, least substituted alkene is favorable and the base is not bulky and stronger in nature, most substituted alkene is the favorable product.

For E2 elimination reaction, proton should be present at $\text{β}$ position to the leaving group in antiperiplaner way.

Zaitsev’s Rule: It is elimination reaction in which the formation of olefin on most hindered or highly substituted position