Chapter 7.11, Problem 7LTS

Interpretation Introduction

Interpretation:

• For the given reaction, the products have to be predicted.
• The major and minor products have to be identified.

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.

Highly polarizable reagents are considered as strong nucleophiles if the conjugate acid of the nucleophile has little nature then those nucleophiles considered as weak bases too. If the reagent is not polarizable and has basic nature, then the reagent is considered as strong base.

Reaction mechanism path is depending on both natures of substrate and reagent.

If the reagent is strong base as well as strong nucleophile and the substrate is primary alkyl halide then the reaction follows ${\text{S}}_{\text{N}}\text{2}$ mechanism if the substrate is secondary alkyl halide then the reaction follows E2 mechanism. For ${\text{S}}_{\text{N}}\text{2}$ mechanism reagent should be strong nucleophile.

If the substrate is tertiary alkyl halide, then the reaction follows ${\text{S}}_{\text{N}}\text{1}$ mechanism rather than ${\text{S}}_{\text{N}}2$ mechanism. (when the reagent is strong nucleophile)

If the reagent is strong bulky base, then the reaction follows E2 mechanism. For E2 reaction, reagent should be strong base.