Carboxylic Acid: An organic compound containing a carboxyl group (COOH), which consists of one carbon atom double-bonded to an oxygen atom and single-bonded to another oxygen atom that is also bonded to a hydrogen atom.
Nucleophilic Acyl Substitution: A reaction mechanism where a nucleophile displaces another group attached to an acyl (carbon-oxygen double bond) group of a carboxylic acid derivative.
Acyl Group: A functional group derived from a carboxylic acid by removing the hydroxyl (-OH) group, represented as RCO-, where R is any hydrocarbon chain