Chapter 17, Problem 17.69P

Interpretation Introduction

Interpretation:

The mechanism and structure for the reactive intermediate form in the given reaction of Grignard reagent with sulfur dioxide followed by methyl bromide are to be drawn.

Concept introduction:

The Grignard reagents $\text{R/Ar-MgX}$ react with compounds containing polar $\text{π}$ bond, where the carbon having an ionic bond with $\text{Mg}$ acts as a nucleophile. The nucleophilic group of Grignard reagent adds to electron-poor atom of polar $\text{π}$ bond. The methyl halides favor ${\text{S}}_{\text{N}}\text{2}$ reaction in the presence of a good nucleophile.