Chapter 30, Problem 30.42P

Interpretation Introduction

Interpretation: A stepwise mechanism for the anionic polymerization of styrene $\left({\text{CH}}_{\text{2}}=\text{CHPh}\right)$ to form polystyrene $-{\left[{\text{CH}}_{\text{2}}\text{CHPh}\right]}_n-$, using $\text{BuLi}$ as the initiator and ${\text{CO}}_2$ as the electrophile that terminates the chain mechanism is to be drawn.

Concept introduction: An alkene $\left({\text{CH}}_{\text{2}}=\text{CHZ}\right)$ that contains $\text{Z}$ group as $\text{Ph,}{\text{CO}}_{\text{2}}\text{R,}\text{COR}$ or $\text{CN}$, undergoes anionic polymerization to yield addition polymers. The initiator used in the reaction is an organolithium reagent. The reaction terminates, when an electrophile or acid is added.