Definition

1. Noun:
   • A chemical compound: Acetic anhydride is a colorless liquid with a strong, pungent odor. It is the simplest isolable anhydride of a carboxylic acid.
   • A reagent in chemical synthesis: It is primarily used as a reagent to introduce an acetyl group into organic compounds, a process known as acetylation.

Usage Examples

• Noun:
  • Acetic anhydride is a key reagent in the production of aspirin.
  • The laboratory has strict controls on the storage of acetic anhydride due to its hazardous nature.
  • The chemical reaction requires the careful addition of acetic anhydride.

Advanced Usage

• In industrial contexts: Acetic anhydride is a major industrial chemical used in the manufacture of cellulose acetate, pharmaceuticals, and dyes.
  • The plant's primary output is acetic anhydride for the plastics industry.
• In regulatory and security contexts: Due to its role in illicit drug manufacturing, the sale and transport of acetic anhydride are heavily monitored in many countries.
  • International tracking of acetic anhydride shipments is a part of narcotics control efforts.

Variants and Related Words

• Acetyl group (n): The functional group (CH₃CO-) transferred by acetic anhydride during acetylation reactions.
• Acetylation (n): The chemical process of introducing an acetyl group into a compound, often using acetic anhydride.
• Acetic acid (n): The carboxylic acid (CH₃COOH) from which acetic anhydride is formally derived.

Synonyms

• Ethanoic anhydride: The systematic IUPAC name for the compound.
• Acetyl oxide: An alternative name reflecting its structure.

Related Phrases

• Acetic anhydride method: A common laboratory procedure for acetylation.
  • The acetic anhydride method is standard for preparing acetate esters.

Noun

1. a compound that is needed in order to refine opium into heroin