Chapter 15.8, Problem 25P

(a)

Interpretation Introduction

Interpretation:

To predict the products of the following transesterification reaction.

(a) $\text{ethyl benzoate + excess isopropanol + HCl}$

Concept introduction:

Transesterification is the process of formation of a new ester molecule from the reaction of alcohol and an ester. This is like hydrolysis of ester but here nucleophile is alcohol molecule instead of ${\text{H}}_{\text{2}}\text{O}$. As alkoxide groups have same basicity, therefore, an excess amount of alcohol is used. The addition of an acid also increases the rate of reaction by protonating the carbonyl oxygen atom. A general transesterification is  written as,

(b)

Interpretation Introduction

Interpretation:

To predict the products of the following transesterification reaction.

(b) $\text{phenyl acetate + excess ethanol + HCl}$

Concept introduction:

Transesterification is the process of formation of a new ester molecule from the reaction of alcohol and an ester. This is like hydrolysis of ester but here nucleophile is alcohol molecule instead of ${\text{H}}_{\text{2}}\text{O}$. As alkoxide groups have same basicity, therefore, an excess amount of alcohol is used. The addition of an acid also increases the rate of reaction by protonating the carbonyl oxygen atom. A general transesterification is  written as,