Chapter 21, Problem 21.3YT

Interpretation Introduction

Interpretation:

The missing curved arrows in the mechanism for the reaction in Equation $\text{21-13}$ is to be drawn.

Concept introduction:

Thionyl chloride (${\text{SOCl}}_{\text{2}}$) and phosphorus trichloride (${\text{PCl}}_{\text{3}}$) are used to convert carboxylic acids into acid chlorides. Of these, thionyl chloride is the more widely used reagent, largely due to the fact that the two byproducts, ${\text{SO}}_{\text{2}}$ and $\text{HCl}$, are gases that can irreversibly bubble out of an organic solvent as they are produced.