Definition

1. Noun:
   • The organic group of acetic acid (CH3CO-): The "ethanoyl group" is a specific chemical structure consisting of a methyl group (CH₃) bonded to a carbonyl group (C=O). It is the acyl group derived from acetic acid.

Usage

• The term "ethanoyl group" is used in the systematic nomenclature of organic chemistry to name compounds where this group is attached to another molecule, such as in esters or amides.
• It is synonymous with the common name "acetyl group." In formal IUPAC nomenclature, "ethanoyl" is the preferred prefix.

Examples

• Noun:
  • The compound is formed by the substitution of a hydrogen atom with an ethanoyl group.
  • In the molecule, the presence of the ethanoyl group is confirmed by infrared spectroscopy.

Advanced Usage

• "Ethanoyl group introduction": Refers to a chemical reaction, like acetylation, where this group is added to a compound.
  • The acetylation process involves the introduction of an ethanoyl group onto the hydroxyl group of the alcohol.

Variants and Related Words

• Acetyl group (n): The common, non-systematic name for the CH₃CO- group.
  • Acetyl-CoA is a crucial molecule in metabolism, containing an acetyl group.
• Ethanoyl chloride (n): A specific compound (CH₃COCl) where the ethanoyl group is bonded to a chlorine atom.
• Acetylation (n): The chemical process of introducing an ethanoyl/acetyl group into a molecule.

Synonyms

• Acetyl group: The most common direct synonym in biochemical and common chemical contexts.

Related Phrases

• Ethanoyl functional group: A phrase emphasizing its role as a functional group in organic molecules.
  • The ethanoyl functional group is characteristic of many esters.

Noun

1. the organic group of acetic acid (CH3CO-)