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Acyl Chlorides

AQA A-level ChemistryCarboxylic Acids and DerivativesLesson 12 of 16

Acyl chlorides are derivatives of carboxylic acids in which the OH group has been replaced by a chlorine atom. Their functional group is -COCl and their general formula is RCOCl.

They are named by replacing the -oic acid ending of the parent acid with -oyl chloride. CH3COCl is ethanoyl chloride and CH3CH2COCl is propanoyl chloride.

Worked example: name CH3CH2CH2COCl. Count the carbons including the C of COCl: there are 4, so the parent acid is butanoic acid and the compound is butanoyl chloride.

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Key terms in this lesson

nucleophilic addition-elimination
A two-step mechanism in which a nucleophile first adds to the carbonyl carbon, then a leaving group is eliminated to reform the C=O bond.

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