acyl anhydrides
Definition
- Noun:
- A class of organic compounds: Acyl anhydrides are chemical compounds characterized by their functional group, which consists of two acyl groups (R-C=O) bonded to an oxygen atom (O). Their defining chemical property is that they react with water (hydrolyze) to yield carboxylic acids.
Usage Examples
- Noun:
- Acetic anhydride, a common acyl anhydride, is used in the synthesis of aspirin.
- The reactivity of acyl anhydrides makes them useful reagents in organic chemistry laboratories.
- Upon exposure to moisture, acyl anhydrides can hydrolyze, forming the corresponding acid.
Advanced Usage
- In chemical nomenclature: The term specifies the type of anhydride formed from carboxylic acids. The name is derived by replacing the word "acid" from the parent carboxylic acid with "anhydride" (e.g., ethanoic acid → ethanoic anhydride).
- In reaction mechanisms: Acyl anhydrides are described as electrophiles that undergo nucleophilic acyl substitution, a fundamental reaction type in organic synthesis.
Variants and Related Words
- Acid anhydride: This is a broader synonym. While "acyl anhydride" typically refers to those derived from carboxylic acids, "acid anhydride" can also include anhydrides of inorganic acids (like sulfuric or phosphoric acid).
- Anhydride (n): The general term for a compound formed by the removal of water from another compound, often an acid.
- Acyl group (n): The R-C=O moiety, which is the key structural component of an acyl anhydride.
Synonyms
- Acid anhydride (when context specifies organic/carboxylic acid derivatives)
Related Phrases and Contexts
- Acylating agent: Acyl anhydrides are frequently described as such because they transfer their acyl group to other molecules.
- Hydrolysis of acyl anhydrides: A standard phrase describing their characteristic reaction with water.
Noun
-
organic compounds that react with water to form an acid
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