Definition

1. Noun:
   • A white cyclic anhydride: A specific chemical compound that is a white, solid substance with a cyclic (ring-shaped) molecular structure. It is classified as an anhydride, meaning it is derived from an acid by the removal of water. It is primarily used in the industrial synthesis of other chemicals, most notably certain types of plastics and dyes.

Usage Examples

• Noun:
  • The laboratory synthesized the polymer using phthalic anhydride as a key monomer.
  • A container of white, crystalline phthalic anhydride was stored in the chemical cabinet.
  • The primary use of phthalic anhydride is in the production of phthalate plasticizers.

Advanced Usage

• As a reagent in organic synthesis: In chemical terminology, "phthalic anhydride" is named as the specific reagent used in a reaction.
  • The dye intermediate was prepared by reacting the amine with phthalic anhydride.

Variants and Related Words

• Phthalic acid (noun): The dicarboxylic acid from which phthalic anhydride is formally derived by dehydration.
  • Heating phthalic acid yields phthalic anhydride.
• Phthalate (noun): A salt or ester of phthalic acid, often produced using phthalic anhydride. Commonly used as plasticizers.
  • Some phthalates are under regulatory scrutiny.

Synonyms

• 1,2-Benzenedicarboxylic anhydride (noun): The systematic IUPAC chemical name for the compound.
• Isobenzofuran-1,3-dione (noun): An alternative systematic name based on its heterocyclic structure.

Related Phrases / Technical Contexts

• Phthalic anhydride process (noun phrase): Refers to the specific industrial method for manufacturing the compound, often by the catalytic oxidation of ortho-xylene or naphthalene.
  • The plant uses a fixed-bed reactor for the phthalic anhydride process.

Noun

1. a white cyclic anhydride