Chapter 18, Problem 18.21P

Interpretation Introduction

Interpretation:

Way in which the given observation bears on the formation of a terahedral carbonyl addition intermediate during acid-catalysed easter hydrolyis, the corresponding transformation has to be shown.

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,