4,4'-(Ethyne-1,2-diyl)diphthalic Anhydride

4,4'-(乙炔-1,2-二基)二酞酸酐

Also known as: 5,5'-(1,2-Ethynediyl)bis[1,3-isobenzofurandione], 5,5'-(ethyne-1,2-diyl)bis(isobenzofuran-1,3-dione), 5-[2-(1,3-dioxo-2-benzofuran-5-yl)ethynyl]-2-benzofuran-1,3-dione, 1,3-Isobenzofurandione, 5,5'-(1,2-ethynediyl)bis-

4,4'-(Ethyne-1,2-diyl)diphthalic Anhydride (CAS 129808-00-0) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C18H6O6 and a molecular weight of 318.23700 g/mol. It is also known as 5,5'-(1,2-Ethynediyl)bis[1,3-isobenzofurandione], 5,5'-(ethyne-1,2-diyl)bis(isobenzofuran-1,3-dione) and 5-[2-(1,3-dioxo-2-benzofuran-5-yl)ethynyl]-2-benzofuran-1,3-dione. Key property: a melting point of 350 °C(dec.). No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.

129808-00-0

Jingsj CID

J-1527643-8

Molecular Formula

C₁₈H₆O₆

Chinese Name

4,4'-(乙炔-1,2-二基)二酞酸酐

Molecular Weight

318.23700 g/mol

Category

Organic Acids

Last updated

8/21/2026