Summary
Alcohols can react with acyl chlorides to form esters through nucleophilic substitution. This process is more efficient than using carboxylic acids due to the higher reactivity of acyl chlorides.
- Acyl Chlorides — organic compounds characterized by the -COCl functional group. Example: Ethanoyl chloride is an acyl chloride.
- Nucleophilic Substitution — a reaction where a nucleophile replaces a leaving group in a molecule. Example: Alcohols reacting with acyl chlorides to form esters.
- Ester — an organic compound formed from an alcohol and an acyl chloride. Example: Ethyl ethanoate is an ester formed from ethanol and ethanoyl chloride.
- Phenoxide Ion — a more potent nucleophile formed by deprotonating phenol. Example: Sodium phenoxide is a phenoxide ion.
Exam Tips
Key Definitions to Remember
- Acyl Chlorides
- Nucleophilic Substitution
- Ester
- Phenoxide Ion
Common Confusions
- Confusing acyl chlorides with carboxylic acids
- Misunderstanding the role of the base in reactions with phenols
Typical Exam Questions
- What is the product when an alcohol reacts with an acyl chloride? An ester is formed.
- Why are acyl chlorides more reactive than carboxylic acids? Acyl chlorides have a more positive carbonyl carbon, making them more susceptible to nucleophilic attack.
- How does a phenol react with an acyl chloride? A phenol reacts with an acyl chloride to form an ester, often requiring heat and a base.
What Examiners Usually Test
- Understanding the mechanism of nucleophilic substitution
- Differences in reactivity between acyl chlorides and carboxylic acids
- Conditions required for reactions involving phenols
