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$$\begin{aligned} \text{Thionyl Chloride Path:} &\quad \text{R-COOH} + \text{SOCl}_2 \longrightarrow \text{R-COCl} + \text{SO}_2(g) \uparrow + \text{HCl}(g) \uparrow \\ \text{Amide Synthesis:} &\quad \text{R-COOH} + \text{NH}_3 \longrightarrow \text{R-COONH}_4 \xrightarrow{\Delta} \text{R-CONH}_2 + \text{H}_2\text{O} \end{aligned}$$
Concept: Halogenation and amination of the carboxyl carbon center. Reacting with thionyl chloride ($$\text{SOCl}_2$$) represents the most efficient synthetic route to generate acid chlorides because both co-products evolve as gases, naturally driving the reaction forward without tedious purification steps.
Notation:
- $$\text{SOCl}_2$$ = Thionyl chloride;
- $$\text{R-COONH}_4$$ = Ammonium carboxylate salt intermediate formed prior to thermal cracking.
