Acid Chloride Reactions and Synthesis

Flashcards covering nucleophilic acyl substitution, reductions, organometallic additions, and preparation methods involving acid chlorides.

Esterification of an Acid Chloride

The reaction of an acid chloride with an alcohol ($R\text{–}OH$) in the presence of pyridine to form an ester ($R\text{–}COOR$). The alcohol attacks the carbonyl, and pyridine neutralizes the generated $HCl$.

Hydrolysis of an Acid Chloride

The reaction of an acid chloride with water ($H_2O$) and pyridine to produce a carboxylic acid ($R\text{–}COOH$). Water acts as the nucleophile while pyridine absorbs the $HCl$.

Acid Chloride Synthesis from Carboxylic Acid

The conversion of a carboxylic acid ($R\text{–}COOH$) into an acid chloride ($R\text{–}COCl$) using thionyl chloride ($SOCl_2$).

Anhydride Formation from an Acid Chloride

The reaction of an acid chloride with a carboxylic acid ($R\text{–}COOH$) in the presence of pyridine to yield an anhydride ($R\text{–}COOOCR$), where the carboxylic acid serves as the nucleophile via its $O\text{–}H$ group.

Primary Amide Synthesis from an Acid Chloride

The reaction of an acid chloride with excess ammonia ($NH_3$) to form a primary amide ($R\text{–}CONH_2$). The excess ammonia acts as the base to neutralize $HCl$, eliminating the need for pyridine.

Secondary Amide Synthesis from an Acid Chloride

The reaction of an acid chloride with excess primary amine ($R\text{–}NH_2$) to produce an $N$-substituted secondary amide ($R\text{–}CONHR$). The second equivalent of the amine neutralizes the $HCl$.

Tertiary Amide Synthesis from an Acid Chloride

The reaction of an acid chloride with excess secondary amine ($R_2NH$) to form an $N,N$-disubstituted tertiary amide ($R\text{–}CONR_2$) bearing no remaining $N\text{–}H$ bonds on the nitrogen.

Full Reduction of an Acid Chloride

A two-step reduction of an acid chloride using 1) excess lithium aluminum hydride ($LiAlH_4$) and 2) $H_2O$ to yield a primary alcohol ($R\text{–}CH_2OH$) through the successive addition of two hydrides.

Partial Reduction of an Acid Chloride

A controlled reduction using 1) $LiAl(OR)_3H$ and 2) $H_2O$ to yield an aldehyde ($R\text{–}CHO$). The bulky, weaker hydride reduces the acid chloride but reacts too slowly with the resulting aldehyde to reduce it further.

Grignard Addition to an Acid Chloride

The addition of 1) excess Grignard reagent ($R\text{–}MgBr$) followed by 2) $H_2O$ to an acid chloride, resulting in a tertiary alcohol ($R\text{–}CR_2OH$) through a ketone intermediate that reacts a second time.

Gilman Reagent Addition to an Acid Chloride

The reaction of an acid chloride with a dialkyl lithium cuprate ($R_2CuLi$) to produce a ketone ($R\text{–}COR$). Because Gilman reagents are less reactive than Grignards, only a single alkyl group adds, and the reaction halts at the ketone.

Role of Pyridine in Acid Chloride Reactions

A non-nucleophilic weak base included in reactions such as esterification, hydrolysis, and anhydride formation to soak up and neutralize the byproduct hydrochloric acid ($HCl$).