carboxyl group
Definition
Noun: * The univalent radical -COOH; present in and characteristic of organic acids: A specific combination of atoms (one carbon, two oxygen, and one hydrogen) that defines a major class of organic compounds known as carboxylic acids. This group is responsible for the acidic properties of these molecules.
Usage
The term carboxyl group is used to identify, describe, and discuss the functional group that gives carboxylic acids their name and chemical behavior. It is a core concept in organic chemistry.
Examples
- Acetic acid, found in vinegar, contains a carboxyl group.
- The carboxyl group can donate a proton (H⁺), making the molecule acidic.
- Fatty acids are characterized by a long hydrocarbon chain attached to a carboxyl group.
Advanced Usage
- Carboxyl group reactivity: The group is involved in key reactions like esterification (forming esters) and amide bond formation (crucial in biochemistry).
- In biochemistry, the ionization state of the carboxyl group (as -COO⁻) is critical for the structure and function of amino acids and proteins.
Variants and Related Words
- Carboxyl (adjective): Pertaining to or containing the carboxyl group.
- Carboxylic acid (noun): An organic acid containing one or more carboxyl groups.
- Carboxylate (noun): The conjugate base form of a carboxylic acid, where the hydrogen of the -OH is lost, leaving a -COO⁻ ion.
Synonyms
- -COOH group: A purely symbolic synonym representing the chemical structure.
- Carboxy group: A less common, abbreviated form with the same meaning.
Related Phrases / Concepts
- Functional group: The carboxyl group is a specific type of functional group.
- Acid dissociation constant (pKa): A measure of the strength of an acid, directly related to the carboxyl group's tendency to lose a proton.
Noun
-
the univalent radical -COOH; present in and characteristic of organic acids
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