Chapter 18, Problem 42P

Interpretation Introduction

(a)

Interpretation: The products formed in the given reaction sequence, are to be stated.

Concept introduction: The Wittig reagent is synthesized in two steps. The first step is ${\text{S}}_{\text{N}}\text{2}$ reaction of ${\text{Ph}}_{\text{3}}\text{P}$ with an alkyl/aryl halide to yield phosphonium salts. The second step is deprotonation of the phosphonium salts with a strong base $\left(\text{BuLi}\right)$ to yield ylide. The Wittig reaction utilizes carbon nucleophile from the Wittig reagent to yield alkenes.

Interpretation Introduction

(b)

Interpretation: The products formed in the given reaction sequence, are to be stated.

Concept introduction: The Wittig reagent is synthesized in two steps. The first step is ${\text{S}}_{\text{N}}\text{2}$ reaction of ${\text{Ph}}_{\text{3}}\text{P}$ with an alkyl/aryl halide to yield phosphonium salts. The second step is deprotonation of the phosphonium salts with a strong base $\left(\text{BuLi}\right)$ to yield ylide. The Wittig reaction utilizes carbon nucleophile from the Wittig reagent to yield alkenes.